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.
I think (but am not certain) the cops say the apartment was the correct apartment.
Wrong. Being directed to the wrong location is commonplace and meaningless. It falls 100% on the cop to make sure. And even if at the right location, it still was an unjustified shoot.
He heard no signs of a domestic argument. And even if there was a gun and it WAS the guy arguing. Him simply holding it down to his side is not justification for blazing away.
You are out of your league on this one.