What if the left reclaimed the narrative on the "non-aggression policy?" It's used as a buzzword for a very selective kind of non-aggression typical of anarcho-capitalism (i.e. they can't ethically kill or extort a fellow capitalist but they can ethically kill or extort any striking worker or leftist they want, deeming us "parasites"). 

Let's offer people an alternative doctrine called True Nonagression. That is, no violence except in self defense, no coercion and no tolerance for coercion.