A universal problem with "leaderless movements" is that they quickly devolve to the lowest common denominator level. Anyone can put out their slate and call themselves an "activist" and it's inevitable that some dim person will come along and try to make a name for themselves by taking things farther. Put that person into a crisis situation with quickly gathering flash mobs, and what should we expect?

Then, on top of that, add on extremist opportunists who decide to exploit the situation, with the goal of destabilizing social order. A "leaderless movement" has all of the biomass of a huge national organization, but none of the immune system and command/control to counter such organized exploiters.

in my opinion raw, unfettered, and disorganized rage is a perfectly valid outlet for the people against the crimes of the American police system.

No. Outside of a protest, the worst actions we've seen would be crimes and qualify the perpetrator as a bad person. Just because they're in a protest doesn't change that. Would you feel that way if they came and burned your house or business down?

Evil is evil. Violence is violence. Another's evil is no excuse to perpetrate your own. Especially if it falls on innocent bystanders.