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Okay, they could have executed Morny, and then everyone could have gotten rid of the Cartel. At least because they were the ones killing civilians, not the first Mafia, so they deserve revenge, and it doesn't matter that they helped catch the serial killer. That's already a closed chapter. Or they could have executed the one who burned the mana. What can one person do alone when the town has overpowered roles, and the first Mafia has protections, even if they're staying at home? How can one person kill them all?