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Craig, a Scotsman, reads about a horrible crime that occurred in Brighton, England, and smugly thinks to himself, “No Scotsman would ever commit such a crime.” It was soon reported that the criminal was, in fact, also a Scotsman; so, Craig revises his thinking, now deciding that “No true Scotsman would commit such a crime!” is an example of this fallacy
What is Moving Goal Posts (No True Scotsman)