Why learn them
The purpose is not to win arguments. Most people fall into these patterns when justifying their own views, and rarely notice at the time. Knowing the names helps you catch the moment slightly earlier. One caveat matters: a faulty argument does not make the conclusion false. Poorly supported claims can still happen to be right, so pointing out a fallacy does not settle the question.
Substituting the other side's claim
The most common is the straw man: replacing what someone said with a more extreme version and attacking that instead. The rebuttal becomes easy, but the original point remains untouched. When you suspect it, the fastest response is simply to restate your actual claim.
- Straw man: attacking a claim that was never made
- Ad hominem: criticising the person, not the argument
- Appeal to authority: true because an expert said so
- Appeal to popularity: true because many believe it
Narrowing the options
False dichotomy presents a situation with several options as though only two exist. Once framed as for or against, middle positions and third alternatives vanish from discussion. The slippery slope works similarly, asserting that a small step must lead to an extreme outcome — while whether those intermediate steps are actually inevitable needs separate proof.
- False dichotomy: only two options presented
- Slippery slope: a small allowance must end in extremes
- False dilemma: compatible options framed as exclusive
- Hasty generalisation: the whole judged from few cases
Assuming the answer in the question
Circular reasoning uses the thing being proved as its own support — this text is correct because it says it is correct. Loaded questions have the same shape, smuggling an unagreed premise into the question so that any answer concedes it. Separate the premise before answering.
Moving the subject
Deflection answers an inconvenient question by changing topic. The 'you do it too' response in particular points at the other party's fault without addressing the original question. Noting an inconsistency can be worthwhile, but it does not support your own claim. When a discussion drifts, returning to what was actually asked is the practical move.
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