One of the big problems with their strategy is that it's not going to trickle down past the universities and large urban centers. You're basically preaching to, more more accurately, lighting the choir on fire when you ravage college campuses and vandalize downtown businesses.
Even a victory against a force of alt-right counter-protestors is pretty pyhrric, as the alt-right isn't much of a force either. Alot of antifa and similar forces are also just Soros paid, unemployed astroturf.
So I don't really see this devolving into civil war, just civil urban unrest and only in highly liberal areas. Nothing the nat'l guard couldn't handle. Or just let it burn and have the liberals crap in their own nest.