Bottom line, cops are not allowed or trained to shoot without warning at the mere presence of a gun. Kid never made a move with it. It isn’t common, but it isn’t rare to answer the door with a pistol. No loud arguing, nothing as the cop walked up. Peephole means nothing because cops always stand to the side.
Kid opens the door and is instantly shot multiple times.
Cop screwed up, kid wasn’t a crook but was a good citizen. Apartment guy taking him there is no excuse. What if your ex wife send cops to your house for some odd reason and you take your pistol with you to the door?
Nope...being sent to the wrong apartment is a big excuse for the cop. And,OTOH,it's pretty clear that the kid didn't need an excuse given that he was doing nothing wrong and yet found himself facing a cop who thought he was responding to a domestic. And we know that domestics often involve enraged psychopath guys with guns or knives.