You can't draw blood from a stone. If community self-organizing gets you the KKK, that community was fucked to begin with. The USA has always been extremely racist, it's a matter of to what extent we give the racist police a legal monopoly on violence and place them above the law. At least when they wear ghost outfits you don't have an illusion of reasonability.

Also note that the KKK never aimed to replace the police for the community the KKK came from, but rather to build upon police oppression of people outside the community. The two situations are not analogous, and if KKK members had to police their own community they would be much more gentle and constructive in their methods.