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: Argument: "No Scotsman puts sugar on his porridge." : Reply: "But my uncle Angus likes sugar with his porridge." : Rebuttal: "Ah yes, but no ''true'' Scotsman puts sugar on his porridge." This form of argument is a Fallacy if the predicate ("putting sugar on porridge") is not actually contradictory for the ''accepted definition'' of the subject ("Scotsman"), or if the definition of the subject is silently adjusted after the fact to make the rebuttal work. Some elements or actions ''are'' exclusively contradictory to the subject, and therefore aren't fallacies. The statement "No ''true'' between a "true vegetarian" and the implied "false vegetarian" cannot likewise be categorized as a fallacy, given the clear disjunction. In Logic , the mutually exclusive contradiction is called a Logical Disjunction . Using the context of culture, individuals of any particular religion, for example, may tend to employ this fallacy. The statement "no true Christian " would do some such thing is often a fallacy, since the term "Christian" is used by a wide and disparate variety of people. This broad nature of the category is such that its use has very little meaning when it comes to defining a narrow property or behaviour. If there is no ''one accepted definition'' of the subject, then the definition must be understood in context, or defined in the initial argument for the discussion at hand. It is also a common fallacy in politics, in which critics may condemn their colleagues as not being "true" Liberal s or Conservative s because they occasionally disagree on certain matters of policy. It comes in many other forms - "No decent person would" - it is argued "support hanging/watch pornography/smoke in public", etc. Often the speaker seems unaware that he/she is, in fact, coercively (re)defining what the phrase "decent person" means to include/exclude what he/she wants and NOT simply following what the phrase is already accepted as meaning. The argument shifts the debate from being about hanging/pornography/smoking and tries to make it seem that anyone disagreeing with the speaker is arguing for the "indecent". |
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