Tell me you don't know anything about this case or law enforcement without telling me you don't know anything about this case or law enforcement.
For starters, as pointed out, he did not point or aim his weapon at anyone other than the people he shot.
Second, as a cop, I'm not shooting the kid unless he threatens me or someone else with the weapon. It starts with loud verbal commands and escalates from there. It is not my job to judge whether he shot in self defense or not. Unless he's an active shooter (he was not), or threatening me or someone else (also not), there is no justification to use deadly force against him.
Your take is bad and you should feel bad.