Why do the ritors ask for Justice?

[abaris]

'Due Process' includes provisions that allow police officers the immediate right to defend themselves and other from people who intend them harm.

Which would be a point if there's an immediate threat. Not a guy turning his back and movng very slowly. Or another one being shot in the back four times while running away from the officer. Who later on tried to plant a weapon on the victim, not knowing that he had been taped. One of the few instances where actual charges were filed. Including this latest one.