Left wing paramilitarism thoughts
I have very deep suspicion that left wing paramilitarism will work about as well as right wing paramilitarism and likely far far worse overall. The right wing was most successful by pretending their paramilitary had nothing to do with them, bunch of lone wolves and the media was absolutely cool with that because they could not handle the truth after Oklahoma city.
Left wing paramilitarism thoughts
Also the very structure of the US media is rooted in capitalism which right wing military does not at it core threaten. I don't have the answer but I do worry that paramilitarism is a false hope that will not lead us to the victory we do need. Peasant revolts are normally crushed at the end of the day because in our modern world the military (and in USA the militarized police) have such fire power I don't see how a few leftist could possibly win
Left wing paramilitarism thoughts
Not that I'm saying don't protect your self or don't try to do things, just that it is dangerous to put our eggs in one basket when that basket is, in my opinion, flimsy. Foundation building isn't fun or glamorous but essential for something that will last. Look to our fascist foes who have multiply attack approaches (think tanks, christian religious, paramilitary, propagandist, business groups, civic groups and so on)
Left wing paramilitarism thoughts
Also to be honest the infighting amongst the leftist can really lead to doom too, one big advantage the communist had in the Russian civil war was that the whites were just so completely incompetent both militarily and politically. We can't count on that good luck (plus the reds had the military rank and file on their side which I doubt we have today in the USA)