True, some are white nationalists and some are Nazis.
Not all Militias are right wing, and if the US had a proper ReichsBanner and a CNT-FAI we wouldn't be in this mess.
Quite frankly, all secular power derives from force and the use of force. When the Right-wing has the Militias, the Paramilitaries, infiltrates the Law Enforcement, the Courts, the Intelligence Services, the military and government, and the Center and Left voluntarily disarms itself and is disorganized, you do not have a functioning nation anymore, you have a set table waiting to be feasted on when the bell rings.
Pink Pistols, John Brown, SRAs, LRAs, Redneck Revolt, BWDL, ARAs (to an extent), HPNGC...just a drop in the bucket. Enough, maybe, to give some PBs and co. pause, and that's all we need right now. To not look - no, to not be- toothless, defenseless, inviting to be feasted on. Anything less is suicidal. Anything more may be self-destructive. But that's just how nations and ideologies compete, ebb, and flow.