> actually already shot someone
This is the issue. There is ZERO video of this (only the aftermath). We don't know why that first guy got shot in the head, or if it was this kid that did it (forensics will show) and that guy he shot had a criminal records.
It could have been a self defense shot too. His ability to control himself after the two he shot on video goes to enforce that idea.
The kid had zero record. It's a bad situation for sure, but I don't think there is enough evidence to say the kid didn't act in self defense.
This is community policing by the way.