Mestroyer 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?
It's evidence against them being a person whose opinion is strong evidence of B, which means it is evidence against B, but it's probably weak evidence, unless their endorsement of B is the main thing giving it high probability in your book.