The chairs flip brings more credibility to a thought that Didds touched on some time ago. What if scum somehow don't actually know about each other? Say, they are all traitors such that a blind shot has a chance of recruitment?
It's an interesting thought. It's definitely hard to make sense of the decision to kill chairs - the gkreig kill does point towards them wanting to kill unexpected targets, which could just be fear of town role powers. The case where it seems to makes sense to kill off-wagon are if there's one scum who was on-wagon, so that should be considered, but at the same time there's WIFOM.