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I.M.J. McInnis's avatar

wow, so just because my dismissal comes from pattern-matching, it's not legitimate? genetic fallacy much?

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Plasma Bloggin''s avatar

Logical fallacies are a dangerous epistemological tool. I'm not as dismissive of them as you appear to be here, because I do think it's legitimately useful to give names to common patterns of bad reasoning so you can dismiss them in the future without having to go through the effort of explaining in detail why they're wrong every time you encounter them. That would be a waste of mental labor and force you to spend less time evaluating novel or compelling arguments. Basically, accusing someone of a logical fallacy is analogous to invoking a previously proven theorem in a mathematical proof. Invoking them is a shorthand for, "This argument is wrong for the same reason other arguments that match this pattern are wrong." Of course, the problem comes when people don't actually know what the fallacious pattern of reasoning is, don't know why it's wrong, or don't realize that the argument they're calling fallacious doesn't have the characteristics that make the pattern of reasoning wrong (this last case is basically someone using an epistemological version of the non-central fallacy). For almost all logical fallacies, the flaw in the argument isn't, "This argument provides literally no evidence for its conclusion," but, "This argument provides very weak evidence in most contexts where it's used, but is often presented as if it's strong evidence." Or occasionally, "This would provide evidence in some circumstances, but it's screened off in this context."

Unfortunately, many people who use logical fallacies don't understand this and use them as thought-terminating clichés, the exact opposite of how they're supposed to be used. The ad hominem example you give is a great one. I'm pretty sure the majority of people online who know the term think that it just means, "insult." And even those who do understand the difference between an ad hominem and an insult likely haven't thought about the fact that undermining the credibility of the source is a perfectly non-fallacious form of ad hominem argument.

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