On Tuesday, after a weekend that included a white supremacist mowing down and killing a peaceful counter-protester in Charlottesville and Nazis marching on the University of Virginia with torches, the president of the United States stood in front of the American people and said, “What about the ‘alt-left’ that came charging at, as you say, the ‘alt-right’? Let me ask you this: What about the fact they came charging—that they came charging with clubs in their hands, swinging clubs? Do they have any problem? I think they do.” There were, as...