Maybe, and this is just me spitballing here, but just maybe if we trained cops not to shoot unarmed people of color as soon as they can train a bead on them with some "reasonable fear" and then to maybe not continue firing until they can no longer pull the trigger, maybe, and again I'm not certain this will work, so just maybe, we won't have so many traffic disruptions.
I know, it feels a bit like giving in to a demanding child, but maybe we shouldn't think of our fellow citizens who see their brothers and sons killed for such flimsy reasons as demanding children. Maybe we should consider that they have a point and we could do better.
I mean, if you really do care about reducing the traffic disporting nature of such marches, it does seem that there may just be a solution that you could work on that doesn't include mowing them down like snowmen.