Tragic story
If the details released are true I wonder why the kid was not compliant with the cop at the onset? Answer the cop questions, then maybe it won’t escalate into aggression especially by a mentally unbalanced cop
I'm guessing that he was not compliant because he was absolutely stunned for being pulled over after trying to do something nice.
Imagine you are walking on a sidewalk and pass a beat cop. You say "hello, officer". The cop responds by ordering you to stop and produce identification. That just might cause you to lose your focus.
So, yeah, the kid was wrong by not obeying the cop's commands. But I can understand his noncompliance here. And I blame the cop ultimately, because it was the cop who stopped the kid for no good reason.