No, sorry, you're right. And in this game, the masons know each other, too. What the mafia doesn't know is who's the cop, the vigilante, who's a mason... all they know is who's mafia. So their hits are not completely random, I guess, but trying to see a pattern from two hits isn't going to get anyone anywhere.
We need more info, and that's either more dead bodies, or the cops!