Actually I (we) don't ban people for political speech we disagree with. Politically passionate people assume we do, but this is an illusion (a total illusion, in fact). Everyone is certain that the mods must be against them—this is a reflexive bias (no doubt hard-wired in all of us somehow) and everyone always interprets it to be against them, their tribe, their team, their side. Even their country. We got accused of being anti-British not long ago!