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Early-stage reasoning errors that haven't yet developed into full fallacies—the seeds of fallacious thinking before they bloom. Proto-fallacies are what you see in arguments that are starting to go wrong but haven't yet crossed the line. A vague generalization that could become a hasty generalization; an emotional appeal that could become a full appeal to emotion. Recognizing proto-fallacies allows intervention before the error solidifies—a chance to steer reasoning back toward soundness. They're the prevention side of fallacy theory.
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