If they do, and it happens. Which it has. In multiple communities. Maybe not all out bloodshed. But if it ever comes down to blacks killing whites on the street. The outcome will not be good for black people. Plus, whitey has the brown Rio De Grande marathon swimmers on their side in a race war.
In my area any concentrations of blacks are ringed by a widening “brown belt” of Hispanics and Asians (the former living there, the latter operating businesses); they have been effectively quarantined, and set upon those interlopers whenever the opportunity presents itself.