Fallacy of analogy
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The fallacy of analogy is a logical fallacy that argues that because one thing resembles another they must be the same. It is frequently used in prejudiced accusations against ethnic groups, and in polemic against religions and religious practices, and by prosecutors in courts of law to persuade judges and juries of the guilt of the accused.
A classic joke says, "If it walks like a duck, talks like a duct, and acts like a duck, it must be a duck—unless it's a politician seeking the duck vote."