They can sleep at night because they are sociopathic crooks and don't give a shit about who got hurt by them ripping them off. They actually enjoy taking peoples money. They figure if they're smart enough to talk their victims into giving it to them, then they eared it and tough shit for the folks that were conned out of it.
The con game is a game of gaining confidence from their victims. It's called a can game for a good reason.
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