Effective because antifa/BLM mayors allow them to be effective.
And of course that’s exactly where the lefts re-education/cleansing actions would begin. Solidify control of the area, action training, scouting for more hard core cadre shock troops as well as providing magnet for like minded yutes from outside.
They’ve ready made it clear that poloce stations are primary targets...just as in every other coup/revolution attempts of the past. Seize weapons, vehicles, reords, comms etc. New boss, lot harder than old boss.
Local media is already on their side