Look, once the punk walked into the store with a gun and the intent to rob it, he was dead. How it occurred is immaterial to me. If the kid had walked in waving the gun around, didn’t see anyone, and the pharmacist walked up behind him and shot him in the head, it would still be a legitimate case of self-defense.
Don’t get things confused, maybe if you can find someone that defends the kid then you can argue with them about that.
To me this is a rare situation where the robbery uncovered an even weirder and creepier guy, a true psycho. To me this event brought to public sight a phony war hero, and bizarre Walter Mitty character.