1) I'm curious as to what you're arguing here. Are you attempting to say that the "Night to Unite" was not actually an effort to bring white supremacist organizers together under one banner? Because I think that would be news to the organizers!
2) I wouldn't call peacefully blocking a march route or street an "unwarranted attack," but instead non-violent resistance. Those specific actions were led by clergy. Yes, there was violence on both sides, and some folks on both sides came well prepared for it. Turns out, both the Right and the Left have some douche bags who never met a problem they didn't think they could punch their way out of. Frankly, I think both are misguided (and I used to be one of those kids dressed all in black, duking it out with neo-Nazis). That said, the reports coming out of Charlottesville are painting the antifa is a fairly decent light. They worked directly with local organizers of the counter-protests, stood in solidarity with a synagogue that neo-Nazis were menacing, and placed themselves between the neo-Nazis and clergy, in an effort to protect the clergy from physical harm. Compare that to the white supremacist groups who harassed a synagogue, harassed black residents, purposefully invoked the imagery of Nazi torch lit parades, and killed a woman.