I often see people call "fallacy" when someone makes a probabilistic statement rather than coming to a definitive conclusion based on a questionable source. For example:
Person 1: I read on ConspiricyBlogs.com that our government comprises many lizard people!
Person 2: That is an extremely unreliable source. Pardon me if I don't believe in lizard people running the government.
Person 1: That is the genetic fallacy! You are judging the truth of the claim by it source!
Had person two said something such as, "That is an unreliable source, therefore the claim must be false," then we could reasonably say that person two's statement was fallacious. However, person two formed an opinion based on the reliability of the source combined with the believably of the claim, and simply refused to accept the claim as true (not insisted that it must be false). This kind of probabilistic reasoning based on limited information is an important part of critical thinking. It is quite reasonable to refuse to accept a claim based on insufficient information or based on poor quality of the source of the information.
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