Summary
In this chapter we have looked at fallacies – flawed patterns of argumentation that may seem convincing at first glance but, on closer inspection, reveal logical flaws.
We have learned:
- Fallacies are flawed patterns of argumentation that violate the principles of logical thinking. They are problematic because they lead to false conclusions, hinder productive discussions and can be used manipulatively.
- Formal fallacies violate the rules of formal logic and are structurally flawed, regardless of content. These include affirming the consequent, denying the antecedent, the fallacy of four terms and the fallacy of the undistributed middle.
- Fallacies of relevance are informal fallacies in which the premises are irrelevant to the conclusion. Examples are ad hominem, argumentum ad populum, argumentum ad verecundiam, argumentum ad misericordiam, argumentum ad baculum, the straw man argument and the red herring.
- Fallacies of ambiguity arise from ambiguities or vagueness in language. These include equivocation, amphiboly, accent, composition and division.
- Fallacies of presumption are based on unjustified or problematic assumptions. Examples are false dichotomy, the loaded question, petitio principii, post hoc ergo propter hoc, cum hoc ergo propter hoc, the slippery slope and argumentum ad ignorantiam.
- Fallacies are particularly common in the media and politics. Typical examples include false balance, anecdotal evidence, emotional appeals, ad hominem attacks, false dichotomies and appeals to tradition or novelty.
- There are various strategies for recognising fallacies, such as asking for evidence, identifying emotional triggers, looking for omitted alternatives, checking sources, paying attention to context and maintaining a healthy scepticism towards perfect solutions.
Understanding fallacies is an essential part of critical thinking. It helps us to see through attempts at manipulation, to argue more precisely and to improve the quality of public discourse.