It does seem to call, perhaps, for some sort of “guardian angels” action... call it vigilantes if you want, but they wouldn’t spring into action until they saw it was clearly needed. They wouldn’t go around baiting trouble, but they would deal righteously with trouble when they found it, even happening to others. Citizens arrest and all that stuff.
Nah, I think they need to be baited and shot.
If they don’t attack, they don’t get shot.
A bunch of tough guys disguised as weak victims. Wreak havok on one night, and then split, leaving cops and gangsta-wannabees scratching their heads.