What would happen if the white supremacists, kkk, and neo nazis (please notice I didn't capitalize any of their names because they don't deserve it) had a rally and no opposition showed up and no press coverage was afforded them? The answer is, there would be no violence and the next time there would be fewer participants, then fewer and fewer.
Their movement would eventually die a slow death without the press and counter protests to keep them going because they thrive on the attention. They think that will convince more people they are right if only they get in front of a camera.
DON'T LET THEM HAVE A VOICE!
Ignore them and it will fade away.
Oh, by the way. This also works for protest from the other side as will. Extremists from either side have a right to protest. Let them, just ignore them
Updated 8/16/2017
Look, to have the kind of fighting that went on, you need two groups with opposing views and the willingness to engage in the violence. You had that, the Alt Right and the Alt Left. Both throwing punches and fighting with the other side. Both are to blame. Can't have that kind of violence with only one side.
