I, and I think most reasonable people who are familiar with the effect of firearms on the human body, have no desire whatever to shoot my fellow citizens for differing from my politics (or for any other reason, either). But civil wars don't commonly start with both sides glaring at one another across a No Man's Land with someone yelling "1-2-3, go!", they start with tit-for-tat atrocities and continue to exhaustion. Fueled by hereditary hatred and weapons supplied from outside sources they can last for decades. No, we really don't want to go there but we can be dragged there by people stupid enough to think that a river of blood will magically wash up on the shores of a utopian paradise.