Logical Fallacies
A logical fallacy is a flaw in reasoning that undermines the logic of an argument. Fallacies can be deceptive because they often appear convincing on the surface. Learning to recognize them is one of the most valuable critical thinking skills — it helps you evaluate arguments more clearly, avoid being misled, and build stronger arguments of your own.
Relevance
These fallacies introduce irrelevant information or attack something other than the actual argument.
Attacking the person making the argument instead of the argument itself.
Misrepresenting someone's argument to make it easier to attack.
Introducing an irrelevant topic to divert attention from the original issue.
Deflecting criticism by pointing out that the accuser does the same thing.
Judging something based on its origin rather than its current merit.
Drawing a conclusion that does not logically follow from the premises.
Presumption
These fallacies make unjustified assumptions or draw conclusions that don't follow from the evidence.
Claiming one event will inevitably lead to a chain of extreme consequences.
Presenting only two options when more alternatives exist.
Drawing a broad conclusion from too few examples or weak evidence.
Treating two significantly different things as if they are comparable.
Using the conclusion as a premise to support that same conclusion.
Shifting the responsibility to disprove a claim rather than prove it.
Dismissing counterexamples by redefining the criteria after the fact.
Assuming that because one event followed another, the first caused the second.
Changing the criteria for proof after the original criteria have been met.
Rejecting a solution because it is not perfect, ignoring that it is an improvement.
Ambiguity
These fallacies exploit unclear or shifting meanings of words and phrases.
Emotional Appeal
These fallacies substitute emotional manipulation or social pressure for logical reasoning.
Using an authority figure's opinion as proof, especially outside their expertise.
Manipulating emotions instead of using evidence to support an argument.
Arguing something is true or good because many people believe or do it.
Claiming something is true because it hasn't been proven false, or vice versa.
Continuing something because of past investment rather than future value.
Arguing that something is good because it is natural, or bad because it is unnatural.
Arguing something is correct because it has always been done that way.
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