Under a belief norm, omissive Moorean sentences like 'P, but I don't believe P' are self-defeating because they violate sincerity, not because assertion implies belief in a normative sense that generates a contradiction.

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Belief norm(describes the rule being discussed in the statement): A rule or standard saying that when you assert something (state it as true), you should actually believe it's true.
Omissive Moorean sentences(the specific type of problematic sentence the statement is analyzing): Sentences that say something is true while denying you believe it (like 'It's raining, but I don't believe it's raining')—named after philosopher G.E. Moore who pointed out how weird these sound.
Self-defeating(describes how using fictional dialogue would contradict the goal of accurate portraiture): An action that works against its own purpose—like trying to stay dry by jumping in a pool.
Sincerity(the specific reason the statement argues these sentences fail): Being genuine and honest—in the context of speech, it means saying things you actually believe rather than lying or contradicting yourself.

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