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I doubt the Mafia will risk killing a Town member. If we execute Nebka, and I hope we do, the remaining Mafia members won't have a reason to kill a Town member, as they'll prefer to give the win to the Town member rather than to us.
Plus, towards the end, they'll pressure us with "probabilities," saying it's better to eliminate the Town member now, with a chance of our victory, where ultimately we'll probably lose to them. The strategy has been analyzed and understood from almost every angle.
So, I would leave behind the wishful thinking where the Mafia does what's good for the Town.