The partial government shutdown is about more than a shutdown. It’s civil war. There are not guns or violence, at least not yet. The U.S. military has not turned against any portion of the citizens. Nobody has openly called for secession yet, at least to the point where it can credibly happen. Not just yet. Yet all these things are just beneath the surface. Any one of these things could happen, almost at any time, although — for perfectly understandable reasons — most of us prefer not yet to know it. Donald Trump came along in the midst of this...