- No true Scotsman
No true Scotsman is an informal logical fallacy, an ad hoc attempt to retain an unreasoned assertion. When faced with a counterexample to a universal claim, rather than denying the counterexample or rejecting the original universal claim, this fallacy modifies the subject of the assertion to exclude the specific case or others like it by rhetoric, without reference to any specific objective rule.
OriginsImagine Hamish McDonald, a Scotsman, sitting down with his Glasgow Morning Herald and seeing an article about how the "Brighton Sex Maniac Strikes Again." Hamish is shocked and declares that "No Scotsman would do such a thing." The next day he sits down to read his Glasgow Morning Herald again and this time finds an article about an Aberdeen man whose brutal actions make the Brighton sex maniac seem almost gentlemanly. This fact shows that Hamish was wrong in his opinion but is he going to admit this? Not likely. This time he says, "No true Scotsman would do such a thing."—Antony Flew, Thinking About Thinking
A simpler rendition would be:
- Alice: All Scotsmen enjoy haggis.
- Bob: My uncle is a Scotsman, and he doesn't like haggis!
- Alice: Well, all true Scotsmen like haggis.
When the statement "all A are B" is qualified like this to exclude those A which are not B, this is a form of begging the question; the conclusion is assumed by the definition of "true A".
An example of a political application of the fallacy could be in asserting that "no democracy starts a war", then distinguishing between mature or "true" democracies, which never start wars, and "emerging democracies", which may start them. At issue is whether or not something labeled as an "emerging democracy" is actually a democracy or something in a different conceptual category.
- Cognitive dissonance
- Loaded language
- Moving the goalposts
- Persuasive definition
- Reification (fallacy)
Informal fallacies Absence paradox · Begging the question · Blind men and an elephant · Cherry picking · Complex question · False analogy · Fallacy of distribution (Composition · Division) · Furtive fallacy · Hasty generalization · I'm entitled to my opinion · Loaded question · McNamara fallacy · Name calling · Nirvana fallacy · Rationalization (making excuses) · Red herring fallacy · Special pleading · Slothful induction Correlative-based fallacies Deductive fallacies Inductive fallacies Vagueness and ambiguity Equivocation Questionable cause List of fallacies · Other types of fallacy
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