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Mafia players won't reveal their own teammates on Haven. Due to the nature of the sets, psychology doesn't work here. They will test you, block you, or redirect their actions, and how will your alibi help you then? Eventually, the real checker will be revealed, like Kosh, and you will be exposed. As a result, you are betraying your team and depriving them of two players, which, again, in the specific conditions of Haven sets with an overpowered town, is equivalent to losing.