>they are usually killed by right wing extremists who are unofficially sanctioned by government and often not prosecuted.

Big citation needed here. You'd be hard pressed to find any deaths here that weren't obvious, often video-documented cases of self-defense. Even then, the state has zealously prosecuted them, in Jake Gardner's case overriding the local prosecutor's determination that no crime had been committed and leading Gardner to suicide. Most ridiculous of them all, Kyle Rittenhouse is facing murder charges when every single one of his so-called victims is on video assaulting him.