The Black Lives Matter protesters march when a black person is killed by the police. Why are many people, among them blacks, killed by police? Because they are brandishing a gun, and the cop is never going to give the brandisher the chance to fire that gun!
So should the cop be blamed solely for the death of the gunman? The cop shot him but the cop would not have had to shoot him if he was not brandishing a gun. If the gunman did not have the gun he would not be dead.
So the protesters should be protesting in front of the district attorney’s office for not doing enough to get guns off the street and out of the hands of felons. If more was done to get rid of guns in the hands of criminals, there would be far fewer gunmen being killed by police.