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This is a list of common fallacies employed in philosophical debates. Some are original from my own experience in PS&P, others were suggested by Shroomerites with attribution given. Still others I plagiarized, uh... I mean borrowed from various sources and doctored them up a bit to make more apropos to PS&P. Several are from Carl Sagan's book, Demon Haunted World.
Feel free to PM suggested improvements or start threads on specific points you'd like to discuss. I'm keeping this thread locked for the sake of conciseness.
Recent changes (03/20/2013): Added Argumentum ad Videbimus (Argument by YouTube Video)
Ad Hominem (Argument to the Man)
Attacking the person instead of attacking his argument. For example, "Von Daniken's books about ancient astronauts are worthless because he is a convicted forger and embezzler." Which is true, but that doesn't make them worthless. An embezzler can put forth a valid argument just like an honest person can.
A common form is an attack on sincerity. For example, "How can you argue for vegetarianism when you wear leather shoes?" The "Two Wrongs Make a Right" fallacy is related. The debate is about vegetarianism. That the arguer wears leather is irrelevant. Wearing leather does not somehow transform someone's argument from valid to invalid, unless the debate is specifically about the type of shoes the arguer wears.
A variation (related to Argument By Generalization) is to attack a whole class of people. For example, "Evolutionary biology is a sinister tool of the materialistic, atheistic religion of Secular Humanism." Similarly, one notorious net.kook waved away a whole category of evidence by announcing "All the scientists were drunk." A drunk can present valid evidence because the validity of the evidence stands on its own and does not hinge on the person presenting it.
Another variation is attack by innuendo: "Why don't scientists tell us what they really know; are they afraid of public panic?" The suggestion that the scientists know more than they're letting on is pure speculation and says nothing about the evidence presented one way or another.
There may be a pretense that the attack isn't happening: "In order to maintain a civil debate, I will not mention my opponent's drinking problem." Unless the topic being debated is the opponent's drinking, mentioning it is as irrelevant as commenting that his tie is ugly.
Sometimes the attack is on intelligence. For example, "If you weren't so stupid you would have no problem seeing my point of view." Or, a dismissing sarcastic comment like "Well, you're just smarter than the rest of us."
An important exception is that Ad Hominem is not fallacious if the attack goes to the credibility of the argument itself. For instance, the argument may depend on its presenter's claim that he's an expert. This is an Appeal to Authority which is often, but not always, fallacious. Trial judges allow this category of attacks. In this very narrow case, the Ad Hominem is valid because the foundation of the counter-argument is the opponent making claims based on his status as an expert, and therefore the personal attack questioning his expert status is valid.
Needling (Argumentum Ad Yo-Mama)
This is simply attempting to make the other person angry without trying to address the argument at hand. Sometimes this is a delaying tactic. Online it can take the form of a reply consisting of a single graemlin or an irrelevant one-liner.
Needling is also Ad Hominem if you insult your opponent. You may instead insult something the other person believes in, interrupt, clown to show disrespect, and numerous other tricks. All of these work better if you are running things - for example, if it is your radio show, and you can cut off microphones, or if you're an internet forum moderator, you can lock threads with the last word.
Straw Man (Fallacy of Extension)
Attacking an exaggerated or caricatured version of your opponent's position. For example, the claim that "evolution means a dog giving birth to a cat". Since this is never observed, evolution theory is refuted.
Another example: "Senator Jones says that we should not fund the attack submarine program. I disagree entirely. I can't understand why he wants to leave us defenseless like that." Nevermind that the submarine program accounts for only 2% of the defense budget.
On the Internet, it is common to exaggerate the opponent's position so that a comparison can be made between the opponent and Hitler.
No True Scotsman
Arguing that a self-described practitioner of some discipline or member of some group is not a true practitioner or member and so any reference to this in an argument is invalid.
For example, someone insists that devoted meditation allows one to levitate. When someone points out that they cannot levitate despite decades of meditation, they're told it's because they're not "really" meditating.
No Scotsman is a thief. But I know a thieving Scotsman. Aye, he's not a true Scotsman.
Inflation of Conflict
Arguing that scholars debate a certain point, therefore they must know nothing, and their entire field of knowledge is "in crisis" or does not properly exist at all.
For example, two historians debated whether Hitler killed five million Jews or six million Jews. A Holocaust denier argued that this disagreement made his claim credible, even though his death count is three to ten times smaller than the known minimum.
Similarly, in "The Mythology of Modern Dating Methods" (John Woodmorappe, 1999) we find on page 42 that two scientists "cannot agree" about which one of two geological dates is "real" and which one is "spurious". Woodmorappe fails to mention that the two dates differ by less than one percent.
Argument From Adverse Consequences (Appeal to Fear, Scare Tactics)
Saying an opponent must be wrong, because if he is right, then bad things would ensue.
For example: God must exist, because a godless society would be lawless and dangerous. Or the defendant in a murder trial must be found guilty, because otherwise husbands will be encouraged to murder their wives.
Wishful thinking is closely related: "My home in Florida is six inches above sea level. Therefore I am certain that global warming will not make the oceans rise by one foot." Of course, wishful thinking can also be about positive consequences, such as winning the lottery, or eliminating poverty and crime.
Special Pleading (Stacking the Deck)
Using the arguments that support your position, but ignoring or somehow disallowing the arguments against.
Uri Geller used special pleading when he claimed that the presence of unbelievers (such as experienced stage magician observers) made him unable to demonstrate his psychic powers.
On the internet, some who claim the ability to astral project also claim that it doesn't work when being tested, but it works fine the rest of the time.
Assuming there are only two alternatives when in fact there are more. For example, assuming Atheism is the only alternative to Fundamentalism, or being a traitor is the only alternative to being a loud patriot.
Short Term Versus Long Term
This is a particular case of the Excluded Middle. For example, "We must deal with crime on the streets before improving the schools." But why can't we do some of both? Similarly, "We should take the scientific research budget and use it to feed starving children."
Burden of Proof
The claim that whatever has not yet been proved false must be true (or vice versa). Essentially the arguer claims that he should win by default if his opponent can't make a strong enough case.
There may be three problems here. First, the arguer claims priority, but can he back up that claim? Second, he is impatient with ambiguity, and wants a final answer right away. And third, "absence of evidence is not evidence of absence."
For example, you can't prove that God does not exist, therefore he does. The absurdity of this argument is highlighted by substituting Tooth Fairy for God in the previous sentence.
Argument by Question
Asking your opponent a question which does not have a snappy answer, or no snappy answer that the audience has the background to understand. Your opponent has a choice: he can look weak or he can look long-winded.
For example, "How can scientists expect us to believe that anything as complex as a single living cell could have arisen as a result of randomness?" To answer this question requires either a long, boring explanation or a snappy explanation only if the audience is already versed in thermodynamics and entropy.
Actually, pretty well any question has this effect to some extent. It usually takes longer to answer a question than to ask it.
Variants are the rhetorical question, and the loaded question, such as "Have you stopped beating your wife?" or "Have evolutionary scientists found a continuum of transitional species in the fossil record?"
Argument by Rhetorical Question
Asking a question in a way that leads to a particular answer. For example, "When are we going to give the old folks of this country the pension they deserve?" The speaker is leading the audience to the answer "Right now." Alternatively, he could have said "When will we be able to afford a major increase in old age pensions?" In that case, the answer he is aiming at is almost certainly not "Right now."
Fallacy of the General Rule
Assuming that something true in general is true in every possible case. For example, "All chairs have four legs." Except that rocking chairs don't have any legs. Similarly, there are times when certain laws should be broken. For example, ambulances are allowed to break speed laws.
Reductive Fallacy (Oversimplification)
Over-simplifying. As Einstein said, "everything should be made as simple as possible, but no simpler." Political slogans such as "Taxation is theft" fall in this category.
Genetic Fallacy (Fallacy of Origins, Fallacy of Virtue)
If an argument or arguer has some particular origin, the argument must be right (or wrong). The idea is that things from that origin, or that social class, have virtue or lack virtue. Being poor or being rich may be held out as being virtuous. Therefore, the actual details of the argument can be overlooked, since correctness can be decided without any need to listen or think.
If you learn the psychological reason why your opponent likes an argument, then he's biased, so his argument must be wrong. Psychoanalyzing your opponent neither adds nor detracts from your argument. It is irrelevant.
Argument of the Beard
Assuming that two ends of a spectrum are the same, since one can travel along the spectrum in very small steps. The name comes from the idea that being clean-shaven must be the same as having a big beard, since in-between beards exist.
Similarly, all piles of stones are small, since if you add one stone to a small pile of stones it remains small.
However, the existence of pink should not undermine the distinction between white and red.
Argument From Age (Wisdom of the Ancients)
Snobbery that very old (or very young) arguments are superior. This is a variation of the Genetic Fallacy, but has the psychological appeal of seniority and tradition (or innovation).
Products labeled "New! Improved!" are appealing to a belief that innovation is of value for such products. It's sometimes true.
Not Invented Here
Ideas from elsewhere are made unwelcome. "This Is The Way We've Always Done It."
This fallacy is a variant of the Argument From Age. It gets a psychological boost from feelings that local ways are superior, that local identity is worth any cost, or that innovations will upset matters. People who use the Not Invented Here argument are often accused of being stick-in-the-mud's.
Conversely, foreign and "imported" things may be held out as superior. A car advertised in the US as having "European Styling" for example.
Argument to the Future
Arguing that evidence will someday be discovered which will (then) support your point.
Poisoning the Wells
Discrediting the sources used by your opponent. This is a variation of Ad Hominem. It may be appropriate in case of the narrow exception of questioning the expert status of a source. See Ad Hominem for details.
Argument by Emotive Language or Video (Appeal to the People)
Using emotionally loaded words to sway the audience's sentiments instead of their minds. Many emotions can be useful: anger, spite, condescension, and so on.
For example, argument by condescension: "Support the ERA? Sure, when the women start paying for the drinks! Hah! Hah!"
Cliche Thinking and Argument By Slogan are useful adjuncts, particularly if you can get the audience to chant the slogan. People who rely on this argument may seed the audience with supporters or "shills", who laugh, applaud or chant at proper moments. This is the live-audience equivalent of adding a laugh track or music track. Now that many venues have video equipment, some speakers give part of their speech by playing a prepared video. These videos are an opportunity to show a supportive audience, use emotional music, show emotionally charged images, and the like. The idea is old: there used to be professional cheering sections.
If the emotion in question isn't harsh, Argument By Poetic Language helps the effect. Flattering the audience doesn't hurt either.
Argument by Personal Charm
Getting the audience to cut you slack. Example: Ronald Reagan. It helps if you have an opponent with much less personal charm.
Charm may create trust, or the desire to "join the winning team", or the desire to please the speaker. This last is greatest if the audience feels sex appeal.
Appeal to Pity (Appeal to Sympathy, The Galileo Argument)
"I did not murder my mother and father with an axe! Please don't find me guilty; I'm suffering enough through being an orphan."
Some authors want you to know they're suffering for their beliefs. For example, "Scientists scoffed at Copernicus and Galileo; they laughed at Edison, Tesla and Marconi; they won't give my ideas a fair hearing either. But time will be the judge. I can wait; I am patient; sooner or later science will be forced to admit that all matter is built, not of atoms, but of tiny capsules of twinkies."
There is a strange variant which shows up on the Internet. Somebody refuses to answer questions about their claims on the grounds that the asker is mean and has hurt their feelings. Or, that the question is personal.
Appeal to Force
Threats, or actual violence. On the Internet, the usual threat is of a lawsuit. The traditional religious threat is that one will burn in Hell. Internet "tough guys" often threaten those who disagree with physical violence if they ever meet. However, history is full of instances where expressing an unpopular idea could get you beaten up on the spot, or worse.
Begging the Question (Assuming the Answer, Tautology)
Reasoning in a circle. The thing to be proved is used as one of your assumptions. For example: "We must have a death penalty to discourage violent crime". (This assumes it discourages crime.) Or, "The stock market fell because of a technical adjustment." But is an "adjustment" just a stock market fall? Or, "The Bible is the literal word of God because it says so in the Bible."
Using what you are trying to disprove. That is, requiring the truth of something for your proof that it is false. For example, using science to show that science is wrong. Or, arguing that you do not exist, when your existence is clearly required for you to be making the argument.
This is a relative of Begging The Question, except that the circularity there is in what you are trying to prove, instead of what you are trying to disprove.
It is also a relative of Reductio Ad Absurdum, where you temporarily assume the truth of something.
Argument From Authority
The claim that the speaker is an expert, and so should be trusted.
There are degrees and areas of expertise. The speaker is actually claiming to be more expert, in the relevant subject area, than anyone else in the room. There is also an implied claim that expertise in the area is worth having. For example, claiming expertise in something hopelessly quack (like iridology) is actually an admission that the speaker is gullible.
This is similar to the Appeal to Authority where someone other than the speaker is referenced as the authority.
Note that no one (or everyone) is an expert on Spirituality or Mysticism as those are completely subjective.
Bare Assertion Fallacy (provided by Shroomerite Mafeki)
If a statement is asserted but not proved, having been offered to be accepted on faith in the speaker, then it is not established as fact. This is related to the Appeal to Authority only in this case, the speaker is not even an expert on the subject matter.
Argument From False Authority
A strange variation on Argument From Authority. For example, the TV commercial which starts "I'm not a doctor, but I play one on TV." Just what are we supposed to conclude?
Appeal to Anonymous Authority
An Appeal To Authority is made, but the authority is not named. For example, "Experts agree that...", "Scientists say..." or even "They say...". This makes the information impossible to verify, and brings up the very real possibility that the arguer himself doesn't know who the experts are. In that case, he may just be spreading a rumor.
The situation is even worse if the arguer admits it's a rumor.
Appeal to Authority
"Albert Einstein was extremely impressed with this theory." But a statement made by someone long-dead could be out of date. Or perhaps Einstein was just being polite. Or perhaps he made his statement in some specific context. And so on.
To justify an appeal, the arguer should at least present an exact quote. It's more convincing if the quote contains context, and if the arguer can say where the quote comes from.
A variation is the Appeal To Anonymous Authority.
Appeal to False Authority
A variation on Appeal to Authority , but the Authority is outside his area of expertise.
For example, "Famous physicist John Taylor studied Uri Geller extensively and found no evidence of trickery or fraud in his feats." Taylor was not qualified to detect trickery or fraud of the kind used by stage magicians. Taylor later admitted Geller had tricked him, but he apparently had not figured out how.
Meanwhile, Johnny Carson exposed Geller as a fraud on national TV. Johnny Carson was a competent stage magician and not easily tricked.
A variation is to appeal to a non-existent authority. For example, someone reading an article by Creationist Dmitri Kuznetsov tried to look up the referenced articles. Some of the articles turned out to be in non-existent journals.
Another variation is to misquote a real authority. There are several kinds of misquotation. A quote can be inexact or have been edited. It can be taken out of context. Chevy Chase: "Yes, I said that, but I was singing a song written by someone else at the time." The quote can be separate quotes which the arguer glued together. Or, bits might have gone missing. For example, it's easy to prove that Mick Jagger is an assassin. In "Sympathy For The Devil" he sang: "I shouted out, who killed the Kennedys, When after all, it was ... me."
Statement of Conversion
The speaker says "I used to believe in X".
This is simply a weak form of asserting expertise. The speaker is implying that he has learned about the subject, and now that he is better informed, he has rejected X. So perhaps he is now an authority, and this is an implied Argument From Authority.
"X" has not actually been countered unless there is agreement that the speaker has that expertise. In general, any bald claim always has to be buttressed.
For example, there are a number of Creationist authors who say they "used to be evolutionists", but the scientists who have rated their books haven't noticed any expertise about evolution.
Claiming that two situations are highly similar, when they aren't. For example, "The solar system reminds me of an atom, with planets orbiting the sun like electrons orbiting the nucleus. We know that electrons can jump from orbit to orbit; so we must look to ancient records for sightings of planets jumping from orbit to orbit also." Except that this model of the atom was superseded by the development of quantum mechanics almost 100 years ago. It shows us that electrons do not "orbit" the nucleus at all. The model is still used only as a didactic aid at the elementary school level of science education because, while inaccurate, it is also simple for children to understand compared to the much more accurate but more complex valence shell model of the atom.
Or, "Minds, like rivers, can be broad. The broader the river, the shallower it is. Therefore, the broader the mind, the shallower it is."
Or, "We have pure food and drug laws; why can't we have laws to keep movie-makers from giving us filth?"
The claim that two things, both analogous to a third thing, are therefore analogous to each other. For example, this debate:
"I believe it is always wrong to oppose the law by breaking it." "Such a position is odious: it implies that you would not have supported Martin Luther King." "Are you saying that cryptography legislation is as important as the struggle for Black liberation? How dare you!"
A person who advocates a particular position (about gun control, for example) may be told that Hitler believed the same thing. The clear implication is that the position is somehow tainted. But Hitler also believed that window drapes should go all the way to the floor. Does that mean people with such drapes are monsters?
An abstract thing is talked about as if it were concrete. A possibly Bad Analogy is being made between concept and reality. For example, "Nature abhors a vacuum."
Assuming that because two things happened, the first one caused the second one. Sequence is not causation. For example, "Before women got the vote, there were no nuclear weapons." Or, "Every time my brother Bill accompanies me to Fenway Park, the Red Sox are sure to lose."
Essentially, these are arguments that the sun goes down because we've turned on the street lights.
Confusing Correlation and Causation
Earthquakes in the Andes were correlated with the closest approaches of the planet Uranus. Therefore, Uranus must have caused them. But Jupiter is nearer than Uranus, and more massive too.
When sales of hot chocolate go up, street crime drops. Does this correlation mean that hot chocolate prevents crime? No, it means that fewer people are on the streets when the weather is cold.
The bigger a child's shoe size, the better the child's handwriting. Does having big feet make it easier to write? No, it means the child is older.
Causal Reductionism (Complex Cause)
Trying to use one cause to explain something, when in fact it had several causes. For example, "The accident was caused by the taxi parking in the street." But other drivers went around the taxi. Only the drunk driver hit the taxi.
Using as evidence a well-known wise saying, as if that is proven, or as if it has no exceptions.
Exception that Proves the Rule
A specific example of Cliche Thinking. This is used when a rule has been asserted, and someone points out the rule doesn't always work. The cliche rebuttal is that this is "the exception that proves the rule". Many people think that this cliche somehow allows you to ignore the exception, and continue using the rule.
In fact, the cliche originally did no such thing. There are two standard explanations for the original meaning.
The first is that the word "prove" meant test. That is why the military takes its equipment to a Proving Ground to test it. So, the cliche originally said that an exception tests a rule. That is, if you find an exception to a rule, the cliche is saying that the rule is being tested, and perhaps the rule will need to be discarded.
The second explanation is that the stating of an exception to a rule, proves that the rule exists. For example, suppose it was announced that "Over the holiday weekend, students do not need to be in the dorms by midnight". This announcement implies that normally students do have to be in by midnight.
In either case, the cliche is not about waving away objections.
Appeal to Widespread Belief (Bandwagon Argument, Peer Pressure, Appeal to Common Practice)
The claim, as evidence for an idea, that many people believe it, or used to believe it, or do it.
If the discussion is about social conventions, such as "good manners", then this is a reasonable line of argument.
However, in the 1800's there was a widespread belief that bloodletting cured sickness. All of these people were not just wrong, but horribly wrong, because in fact it made people sicker. Clearly, the popularity of an idea is no guarantee that it's right.
Similarly, a common justification for bribery is that "Everybody does it". And in the past, this was a justification for slavery.
Fallacy of Composition
Assuming that a whole has the same simplicity as its constituent parts. In fact, a great deal of science is the study of emergent properties. For example, if you put a drop of oil on water, there are interesting optical effects. But the effect comes from the oil/water system: it does not come just from the oil or just from the water.
Another example: "A car makes less pollution than a bus. Therefore, cars are less of a pollution problem than buses."
Another example: "Atoms are colorless. Cats are made of atoms, so cats are colorless."
Fallacy of Division
Assuming that what is true of the whole is true of each constituent part. For example, human beings are made of atoms, and human beings are conscious, so atoms must be conscious.
Complex Question (Tying)
Unrelated points are treated as if they should be accepted or rejected together. In fact, each point should be accepted or rejected on its own merits.
For example, "Do you support freedom and the right to bear arms?"
Slippery Slope Fallacy (Camel's Nose)
There is an old saying about how if you allow a camel to poke his nose into the tent, soon the whole camel will follow.
The fallacy here is the assumption that something is wrong because it is right next to something that is wrong. Or, it is wrong because it could slide towards something that is wrong.
For example, "Allowing abortion in the first week of pregnancy would lead to allowing it in the ninth month." Or, "If we legalize marijuana, then more people will try heroin." Or, "If I make an exception for you then I'll have to make an exception for everyone."
Argument by Pigheadedness (Doggedness)
Refusing to accept something after everyone else thinks it is well enough proved. For example, there are still Flat Earthers.
Appeal to Coincidence
Asserting that some fact is due to chance. For example, the arguer has had a dozen traffic accidents in six months, yet he insists they weren't his fault. This may be Argument By Pigheadedness. But on the other hand, coincidences do happen, so this argument is not always fallacious.
Argument by Repetition (Argument Ad Nauseam)
If you say something often enough, some people will begin to believe it. There are some Internet kooks who keep reposting the same articles, presumably in hopes it will have that effect.
Argument by Half Truth (Suppressed Evidence)
This is hard to detect, of course. You have to ask questions. For example, an amazingly accurate "prophecy" of the assassination attempt on President Reagan was shown on TV. But was the tape recorded before or after the event? Many stations did not ask this question. (It was recorded afterwards.)
A book on "sea mysteries" or the "Bermuda Triangle" might tell us that the yacht Connemara IV was found drifting crewless, southeast of Bermuda, on September 26, 1955. None of these books mention that the yacht had been directly in the path of Hurricane Iona, with 180 mph winds and 40-foot waves.
Cherry Picking (Argument by Selective Observation, AKA Texas Sharpshooter Fallacy)
The enumeration of favorable circumstances, or as the philosopher Francis Bacon described it, counting the hits and forgetting the misses. For example, a state boasts of the Presidents it has produced, but is silent about its serial killers. Or, the claim "Technology brings happiness". (Now, there's something with hits and misses.)
Casinos encourage this human tendency. There are bells and whistles to announce slot machine jackpots, but losing happens silently. This makes it much easier to think that the odds of winning are good.
Believers in 'synchronicity' often fall pray to this mode of thinking. They remember the 'amazing' coincidence when a friend they were just thinking about calls on the phone, but forget a thousand other times when it didn't happen.
Argument by Selective Reading
Making it seem as if the weakest of an opponent's arguments was the best he had. Suppose the opponent gave a strong argument X and also a weaker argument Y. Simply rebut Y and then say the opponent has made a weak case.
This is a relative of Argument By Selective Observation, in that the arguer overlooks arguments that he does not like. It is also related to Straw Man (Fallacy Of Extension), in that the opponent's argument is not being fairly represented.
Argument by Generalization
Drawing a broad conclusion from a small number of perhaps unrepresentative cases. The cases may be unrepresentative because of Selective Observation.
For example, "They say 1 out of every five people is Chinese. How is this possible? I know hundreds of people, and none of them is Chinese." So, by generalization, there aren't any Chinese anywhere. This is connected to the Fallacy Of The General Rule.
It is also possible to under-generalize. For example, "A man who had killed both of his grandmothers declared himself rehabilitated, on the grounds that he could not conceivably repeat his offense in the absence of any further grandmothers."
Argument from Intimidation
There is a certain type of argument which, in fact, is not an argument, but a means of forestalling debate and extorting an opponent’s agreement with one’s undiscussed notions. It is a method of bypassing logic by means of psychological pressure . . . [It] consists of threatening to impeach an opponent’s character by means of his argument, thus impeaching the argument without debate. Example: “Only the immoral can fail to see that Candidate X’s argument is false.” . . . The falsehood of his argument is asserted arbitrarily and offered as proof of his immorality.
The essential characteristic of the Argument from Intimidation is its appeal to moral self-doubt and its reliance on the fear, guilt or ignorance of the victim. It is used in the form of an ultimatum demanding that the victim renounce a given idea without discussion, under threat of being considered morally unworthy. The pattern is always: “Only those who are evil (dishonest, heartless, insensitive, ignorant, etc.) can hold such an idea.”
Argument from Small Numbers
"I've thrown three sevens in a row. Tonight I can't lose." This is Argument By Generalization, but it assumes that small numbers are the same as big numbers. Three sevens is actually a common occurrence. Thirty three sevens is not.
Or: "After treatment with the drug, one of three mice was cured, one of three died, and the third mouse showed no change." Does this mean that if we treated a thousand mice, 333 would be cured? Well, no.
Misunderstanding the Nature of Statistics
President Dwight Eisenhower expressed astonishment and alarm on discovering that approximately half of all Americans had below average intelligence. Similarly, some people get fearful when they learn that their doctor wasn't in the top half of his class.
"Statistics show that of those who contract the habit of eating, very few survive." -- Wallace Irwin.
Very few people seem to understand "regression to the mean". This is the idea that things tend to go back to normal. If you feel normal today, does it really mean that the headache cure you took yesterday performed wonders? Or is it just that headaches are usually gone the next day? This argument is popular among proponent of homeopathy.
For example, the declining life expectancy in the former Soviet Union is due to the failures of communism. But, the quite high infant mortality rate in the United States is not a failure of capitalism.
This is related to Internal Contradiction.
Something that just does not follow. For example, "Tens of thousands of Americans have seen lights in the night sky which they could not identify. The existence of life on other planets is fast becoming certainty!"
Another example: arguing at length that your religion is of great help to many people. Then, concluding that the teachings of your religion are undoubtedly true.
Or: "Bill lives in a large building, so his apartment must be large."
Meaningless Questions / Statements
Irresistible forces meeting immovable objects.
God knows your future, but you have free will.
Argument by Poetic Language
If it sounds good, it must be right. Songs often use this effect to create a sort of credibility - for example, "Don't Fear The Reaper" by Blue Oyster Cult. Politically oriented songs should be taken with a grain of salt, precisely because they sound good.
Argument by Slogan
If it's short, and connects to an argument, it must be an argument. But slogans risk the Reductive Fallacy.
Being short, a slogan increases the effectiveness of Argument By Repetition. It also helps Argument By Emotive Language (Appeal To The People), since emotional appeals need to be punchy. Using an old slogan is Cliche Thinking.
Argument by Prestigious Jargon
Using big complicated words so that you will seem to be an expert. Why do people use "utilize" when they could utilize "use" ?
For example, crackpots used to claim they had a Unified Field Theory (after Einstein). Then the word Quantum was popular. Lately it seems to be Zero Point Fields and Casimir Effect.
Argument by Gibberish (Bafflement)
This is the extreme version of Argument By Prestigious Jargon. An invented vocabulary helps the effect, and some Internet kooks use lots of cAPiTaLiZatIOn. However, perfectly ordinary words can be used to baffle. For example, "Omniscience is greater than omnipotence, and the difference is two. Omnipotence plus two equals omniscience. META = 2." [From R. Buckminster Fuller's No More Secondhand God.]
Gibberish may come from people who can't find meaning in technical jargon, so they think they should copy style instead of meaning. It can also be a "snow job", AKA "baffle them with BS", by someone actually familiar with the jargon. Or it could be Argument by Poetic Language.
An example of poetic gibberish: "Each autonomous individual emerges holographically within egoless ontological consciousness as a non-dimensional geometric point within the transcendental thought-wave matrix in linear time." But what is "linear time" and how is it different from ordinary time?
Using a word to mean one thing, and then later using it to mean something different. For example, sometimes "Free software" costs nothing, and sometimes it is without restrictions. Some examples:
"The sign said 'fine for parking here', and since it was fine, I parked there."
All trees have bark. All dogs bark. Therefore, all dogs are trees.
"Consider that two wrongs never make a right, but that three lefts do." - "Deteriorata", National Lampoon
The use of words that sound better. The lab rat wasn't killed, it was sacrificed. Mass murder wasn't genocide, it was ethnic cleansing. The death of innocent bystanders is collateral damage. Microsoft doesn't find bugs, or problems, or security vulnerabilities: they just discover an issue with a piece of software.
This is related to Argument By Emotive Language, since the effect is to make a concept emotionally palatable.
This is very much like Euphemism, except that the word changes are done to claim a new, different concept rather than soften the old concept.
For example, an American President may not legally conduct a war without a declaration of Congress. So, various Presidents have conducted "police actions", "armed incursions", "protective reaction strikes", "pacification", "safeguarding American interests", and a wide variety of "operations". Similarly, War Departments have become Departments of Defense, and untested medicines have become alternative medicines.
The book "1984" by George Orwell has some particularly good examples.
Error of Fact
For example, "No one knows how old the Pyramids of Egypt are." Except, of course, for the historians who've read the records written by the ancient Egyptians themselves. Typically, the presence of one error means that there are other errors to be uncovered.
Or: there is no way humans without modern machines could have placed the stones of the Pyramids with such precision. But Isaac Newton ground the mirror of the telescope design that today bears his name to an amazing accuracy of 1/10 the wavelength of light! And he did this by hand!
Hypothesis Contrary to Fact
Arguing from something that might have happened, but didn't.
Example: "If we hadn't invaded Iraq, Hussein would have developed WMD".
Saying two contradictory things in the same argument. For example, claiming that Archeopteryx is a dinosaur with hoaxed feathers, and also saying in the same book that it is a "true bird". Or another author who said on page 59, "Sir Arthur Conan Doyle writes in his autobiography that he never saw a ghost." But on page 200 we find "Sir Arthur's first encounter with a ghost came when he was 25, surgeon of a whaling ship in the Arctic..."
This is much like saying "I never borrowed his car, and it already had that dent when I got it."
This is related to Inconsistency.
Changing the Subject (Digression, Red Herring, Misdirection, False Emphasis)
This is sometimes used to avoid having to defend a claim, or to avoid making good on a promise. In general, there is something you are not supposed to notice.
For example, I got a bill which had a big announcement about how some tax had gone up by 5%, and the costs would have to be passed on to me. But a quick calculation showed that the increased tax was only costing me a dime, while a different part of the the bill had silently gone up by $10.
It is connected to various rhetorical tricks, such as announcing that there cannot be a question period because the speaker must leave. But then he doesn't leave.
Argument by Fast Talking
If you go from one idea to the next quickly enough, the audience won't have time to think. This is connected to Changing The Subject and (to some audiences) Argument By Personal Charm.
However, some psychologists say that to understand what you hear, you must for a brief moment believe it. If this is true, then rapid delivery does not leave people time to reject what they hear.
Having Your Cake (Failure to Assert, or Diminished Claim)
Almost claiming something, but backing out. For example, "It may be, as some suppose, that ghosts can only be seen by certain so-called sensitives, who are possibly special mutations with, perhaps, abnormally extended ranges of vision and hearing. Yet some claim we are all sensitives."
Another example: "I don't necessarily agree with the liquefaction theory, nor do I endorse all of Walter Brown's other material, but the geological statements are informative." The strange thing here is that liquefaction theory (the idea that the world's rocks formed in flood waters) was demolished in 1788. To "not necessarily agree" with it, today, is in the category of "not necessarily agreeing" with 2+2=3. But notice that writer implies some study of the matter, and only partial rejection.
A similar thing is the failure to rebut. Suppose I raise an issue. The response that "Woodmorappe's book talks about that" could possibly be a reference to a resounding rebuttal. Or perhaps the responder hasn't even read the book yet. How can we tell? (I later discovered it was the latter.)
A statement is made, but it is sufficiently unclear that it leaves some sort of leeway. For example, a book about Washington politics did not place quotation marks around quotes. This left ambiguity about which parts of the book were first-hand reports and which parts were second-hand reports, assumptions, or outright fiction.
Of course, lack of clarity is not always intentional. Sometimes a statement is just vague.
If the statement has two different meanings, this is Amphiboly. For example, "Last night I shot a burglar in my pajamas."
Failure to State
If you make enough attacks, and ask enough questions, you may never have to actually define your own position on the topic.
Information is given, but it is not the latest information on the subject. For example, some creationist articles about the amount of dust on the moon quote a measurement made in the 1950's. But many much better measurements have been done since then.
The speaker seems to have information that there is no possible way for him to get, on the basis of his own statements. For example: "The first man on deck, seaman Don Smithers, yawned lazily and fingered his good luck charm, a dried seahorse. To no avail! At noon, the Sea Ranger was found drifting aimlessly, with every man of its crew missing without a trace!"
Least Plausible Hypothesis
Ignoring all of the most reasonable explanations. This makes the desired explanation into the only one. For example: "I left a saucer of milk outside overnight. In the morning, the milk was gone. Clearly, my yard was visited by fairies."
There is an old rule for deciding which explanation is the most plausible. It is most often called "Occam's Razor", and it basically says that the simplest is usually the best. The current phrase among scientists is that an explanation should be "the most parsimonious", meaning that it should not introduce new concepts (like fairies) when old concepts (like neighborhood cats) will do.
Argument by Scenario
Telling a story which ties together unrelated material, and then using the story as proof they are related.
Affirming the Consequent
Logic reversal. A correct statement of the form "if P then Q" gets turned into "Q therefore P".
For example, "All people whose surname begins with Mac are of Scottish ancestry. Dougal is of Scottish ancestry. Therefore his surname begins with Mac." But actually his name is Campbell.
Another example: "If the earth orbits the sun, then the nearer stars will show an apparent annual shift in position relative to more distant stars (stellar parallax). Observations show conclusively that this parallax shift does occur. This proves that the earth orbits the sun." In reality, it proves that Q [the parallax] is consistent with P [orbiting the sun]. But it might also be consistent with some other theory. Other theories did exist at one time. They are now dead because, although they were consistent with a few available facts, they were not consistent with all the facts.
Another example: "If space creatures were kidnapping people and examining them, the space creatures would probably hypnotically erase the memories of the people they examined. These people would thus suffer from amnesia. But in fact many people do suffer from amnesia. This tends to prove they were kidnapped and examined by space creatures." This is also a Least Plausible Hypothesis explanation.
Shifting the Goalposts (Raising the Bar, Argument by Demanding Impossible Perfection)
If your opponent successfully addresses some point, then tell him he must also address some further point. If you can make these points more and more difficult (or diverse) then eventually your opponent must fail. If nothing else, you will eventually find a subject that your opponent isn't well versed in.
This is related to Argument By Question. Asking questions is easy: it's answering them that's hard.
It is also possible to lower the bar, reducing the burden on an argument. For example, a person who takes Vitamin C might claim that it prevents colds. When they do get a cold in spite of taking Vitamin C, they move the goalposts by saying that the cold would have been much worse if not for the Vitamin C.
Appeal to Complexity
If the arguer doesn't understand the topic, he concludes that nobody understands it. So, his opinions are as good as anybody's.
Unfortunately, there simply isn't a common-sense answer for many questions. In politics, for example, there are a lot of issues where people disagree. Each side thinks that their answer is common sense. Clearly, some of these people are wrong.
The reason they are wrong is because common sense depends on the context, knowledge and experience of the observer. That is why instruction manuals will often have paragraphs like these:
When boating, use common sense. Have one life preserver for each person in the boat.
When towing a water skier, use common sense. Have one person watching the skier at all times.
If the ideas are so obvious, then why the second sentence? Why do they have to spell it out? The answer is that "use common sense" actually meant "pay attention, I am about to tell you something that inexperienced people often get wrong."
Science has discovered a lot of situations which are far more unfamiliar than water skiing. Not surprisingly, beginners find that much of it violates their common sense. For example, many people can't imagine how a mountain range would form. But in fact anyone can take good GPS equipment to the Himalayas and measure for themselves that those mountains are rising today.
Argument by Laziness (Argument by Uninformed Opinion)
The arguer hasn't bothered to learn anything about the topic. He nevertheless has an opinion, and will be insulted if his opinion is not treated with respect. For example, someone looked at a picture on one of my web pages and made a complaint which showed that he hadn't even skimmed through the words on the page. When I pointed this out, he replied that I shouldn't have had such a confusing picture.
Disproof by Fallacy
If a conclusion can be reached in an obviously fallacious way, then the conclusion is incorrectly declared wrong. For example,
"Take the division 64/16. Now, canceling a 6 on top and a six on the bottom, we get that 64/16 = 4/1 = 4." "Wait a second! You can't just cancel the six!" "Oh, so you're telling us 64/16 is not equal to 4, are you?"
Note that this is different from Reductio Ad Absurdum, where your opponent's argument can lead to an absurd conclusion. In this case, an absurd argument leads to a normal conclusion.
Reductio Ad Absurdum
Showing that your opponent's argument leads to some absurd conclusion. This is in general a reasonable and non-fallacious way to argue. If the issues are razor-sharp, it is a good way to completely destroy his argument. However, if the waters are a bit muddy, perhaps you will only succeed in showing that your opponent's argument does not apply in all cases, That is, using Reductio Ad Absurdum is sometimes using the Fallacy Of The General Rule. However, if you are faced with an argument that is poorly worded, or only lightly sketched, Reductio Ad Absurdum may be a good way of pointing out the holes.
An example of why absurd conclusions are bad things:
Bertrand Russell, in a lecture on logic, mentioned that in the sense of material implication, a false proposition implies any proposition. A student raised his hand and said "In that case, given that 1 = 0, prove that you are the Pope". Russell immediately replied, "Add 1 to both sides of the equation: then we have 2 = 1. The set containing just me and the Pope has 2 members. But 2 = 1, so it has only 1 member; therefore, I am the Pope."
If one does not understand a debate, it must be "fair" to split the difference, and agree on a compromise between the opinions. But one side is very possibly wrong, and in any case one could simply suspend judgment. Journalists often invoke this fallacy in the name of "balanced" coverage.
Television reporters like balanced coverage so much that they may give half of their report to a view held by a very small minority of the people in question. There are many possible reasons for this, some of them good. However, viewers need to be aware of this tendency.
Fallacy of the Crucial Experiment
Claiming that some idea has been proved (or disproved) by a pivotal discovery. This is the "smoking gun" version of history.
Scientific progress is often reported in such terms. This is inevitable when a complex story is reduced to a soundbite, but it's almost always a distortion. In reality, a lot of background happens first, and a lot of buttressing (or retraction) happens afterwards. And in natural history, most of the theories are about how often certain things happen (relative to some other thing). For those theories, no one experiment could ever be conclusive.
Two Wrongs Make a Right (Tu Quoque, You Too)
A charge of wrongdoing is answered by a rationalization that others have sinned, or might have sinned. For example, Bill borrows Jane's expensive pen, and later finds he hasn't returned it. He tells himself that it is okay to keep it, since she would have taken his.
War atrocities and terrorism are often defended in this way.
Similarly, some people defend capital punishment on the grounds that the state is killing people who have killed.
This is related to Ad Hominem (Argument To The Man).
A fraud done to accomplish some good end on the theory that the end justifies the means.
For example, a church in Canada had a statue of Christ which started to weep tears of blood. When analyzed, the blood turned out to be beef blood. We can reasonably assume that someone with access to the building thought that bringing souls to Christ would justify his small deception.
Another example: "We felt the effects of marijuana were so dangerous that it was better to lie to the American public to save them rather than tell them the truth." -- Partnership for a Drug Free America
In the context of debates, a Pious Fraud could be a lie. More generally, it would be when an emotionally committed speaker makes an assertion that is shaded, distorted or even fabricated. For example, British Prime Minister Tony Blair was accused in 2003 of "sexing up" his evidence that Iraq had Weapons of Mass Destruction.
Around the year 400, Saint Augustine wrote two books, De Mendacio (On Lying) and Contra Medacium (Against Lying), on this subject. He argued that the sin isn't in what you do (or don't) say, but in your intent to leave a false impression. He strongly opposed Pious Fraud. I believe that Martin Luther also wrote on the subject.
Package Dealing (provided by Shroomerite RationalEgo)
This is the fallacy of failing to discriminate crucial differences. It consists of treating together, as parts of a single conceptual whole or "package", elements which differ essentially in nature, truth-status, importance, or value.
Stolen Concept (provided by Shroomerite RationalEgo)
This is the fallacy of using a concept while denying the validity of its genetic roots, i.e., of an earlier concept(s) on which it logically depends.
Argument by Fatigue (AKA Argument by Wall-o-Text)
This is when a rebuttal takes the form of a dense, poorly-constructed, multi-page wall of text rendering anyone with a dissenting view so overwhelmed by the daunting task of parsing it that they give up and concede the debate. This is most effective when the wall-o-text contains one of more of the following: no capitalization, odd punctuation, incomplete sentences, misspellings, and no paragraph spacing.
Closely related is the Argument by Question.
Argument from Ignorance
Arguing that we don't know something, therefore we know something else. For example, we don't know where the universe came from, therefore it was created by god. God may in fact have created the universe, or maybe not, but not knowing where it came from means we don't know where it came from and nothing else.
A variation is that, although every psychic whose powers have been rigorously tested has failed to perform as they claim they can, we have not tested every psychic in the world, therefore some of them may be able to do what they claim. There may be genuine psychics in the world, but it may also be true that the Tooth Fairy exists and lives in a nice condo on Venus. Nevertheless, it is absurd to believe these things are true simply because, from a strict epistemological point of view, they are possible.
Proving a Negative Generally (Proving Contingent Negative Existentials)
Arguing that because you can't prove something doesn't exist, like god, it does exist. The problem with this argument is that there is no way to satisfy the counter-claim. For example, someone claims that because I can't prove the Tooth Fairy doesn't exist, she does exit.
Let's assume for argument's sake that the Tooth Fairy does NOT exist. What would proof of that look like?
If you look in your closet and she's not there, is that proof of her non-existence? No, she might not be in that closet but maybe she's in some other closet.
If you look in every closet in the world and she's not there, is that proof of her non-existence? No, she might be in your bathroom instead.
If you search every bathroom on the planet? No, she might live on Mars. You may begin to see the impossibility of proving the general case that something doesn't exist.
With that said, it should be understood that mathematics can expressly prove the negative. For example, denying the consequent in the modus tollens form of propositional logic as: ( p → q, ¬q∴ ¬p )
However, this is generally not useful in an argument outside the context of mathematical theorems.
Argument by Lies
Intentional Errors of Fact.
If the speaker thinks that lying serves a moral end, this would be a Pious Fraud.
Example: "We felt the effects of marijuana were so dangerous that it was better to lie to the American public to save them rather than tell them the truth." -- Partnership for a Drug Free America
Argument by Exaggeration
This is a milder form of Argument by Lies. For example, the food industry adds mountains of MSG to our food. In fact, too much MSG makes food unappealing just like too much salt does. So if the food industry really added "mountains" of MSG to food, they would go out of business for lack of customers who reject their products for poor taste.
Argumentum ad Videbimus (Argument by YouTube Video)
This is when an arguer is unable to counter a line of reasoning with a rational rebuttal and instead posts a video (or numerous videos or even links to entire books) while refusing to argue a position himself. Strangely, the presenter expects his opponents to do his job by having them sift through a video or book to find HIS point of argument rather than expressing it himself directly. This refusal to express directly what he finds persuasive in the video or book renders his argument null.
The Burden of Proof, Argument by Emotive Language or Video, and Argument by Question are related.
1) You can't get married to your spouse who is the same sex as you.
2) You can't have an abortion no matter how much you don't want a child.
3) You can't have a certain plant in your possession or you'll get locked up with a rapist and a murderer.