What made you think I think Setzer's mafia? I'm looking around with a spotlight and seeing what it picks up. ;D
There's little to judge about inactives and nothing gained in killing all inactives if there is one mafia pretending to be inert. The net loss is too high.
It does McFly. An inactive town is still one more person for mafia to kill whether they do it at night or not. It doesnt matter if they're here or not but that they need to be dead for mafia to win.