Well I suppose "getting to know the faction more" means agreeing to a wholesale slaughter of the strip when there was never a notion or agreement of such a thing ever occurring. My only option after helping out the group there is to tell Yes Man that I apparently agreed to help them kill everybody, when even the leader never told me (or will tell me) what their plans were.

I can't change it by assaulting the casino, and there's no chance to ignore them like you can with some other factions. All I can do now is hope to help their little assault on the strip fail somehow.

So far this game has seemed to lead me down a destructive path by making things seem like they're just for the caps when suddenly they're huge story-changing decisions.