I'm not 100% how traitor works but if he counts as a mafia then this setup is too over powered for mafia because it takes away vig's ability to shoot N1 like they can in the other setup.
In this setup, if vig shoots N1 and 2 town die, it's automatically game over = maf wins.
In the other one, with a fool, if vig shoots N1 even if 2 town die, mafia still have to force a NL and vig has another shot to kill one before the town loses.
He does not count towards the "Mafia winning" condition. So if Vig mis-shoots N1, and there are say 2 Mafia, 1 Traitor and 3 Town then they can force NL, but do not insta-win. You are right about it being scum-sided though, as is FT3.