Now I don't mean to play Devil's Advocate but are we sure he even meant to hit anyone? He killed himself at the end despite not wounding or killing anybody, so I'm pretty convinced he just wanted to die in a way everyone would see. Firing off a gun inside a crowded room is gonna get you shot by security or police, even if you don't hit anybody.
I could be wrong, of course, and maybe he's just a shit shot, but I have my suspicions that he wanted to die more than he wanted to kill someone.