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That's not the example of backwards reasoning that I provided. The example I provided was analogous to your argument about why mushrooms produce psiloc(yb)in. The example you've just provided, is NOT analogous.
Also,for the sake of argument, if you're inclined to follow the theoretical framework of evolution: perhaps the environmental cues which caused certain species of mushrooms to produce psiloc(yb)in no longer exists. Though producing psiloc(yb)in doesn't serve a function any longer, it's not maladaptive (mushrooms don't die off because they produce it). Thus, there's no necessity for mushrooms to STOP producing psiloc(yb)in.
That's just for argument's sake, but it makes sense, and mirrors evolutionary theories which already exist (in other words, I'm not just making arguments up off the top of my head, if that will make you think any more about it).