army1987 comments on Open thread, September 2-8, 2013 - Less Wrong Discussion
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Is there a name for, taking someone being wrong on A as evidence as being wrong on B? Is this a generally sound heuristic to have? In the case of crank magnetism; should I take someone's crank ideas, as evidence against an idea that is new and unfamiliar to me?
Yes, but in many cases it's very weak evidence. Overweighing it leads to the “reversed stupidity” failure mode.