BLM got to this kid, the blood is on their hands.
This is really the saddest part of the story, and the one that is going to be under reported.
Just as the Islamists are able to turn ordinary, passive people into radical killers, the BLM movement breaks down the common sense, and experience of a lot of susceptible and weak people; and replace it with the victimhood and persecution mindset. Those are the ones that become dangerous.