Is there anything to the claims that this guy was being unfairly persecuted? I'd be surprised because most who lash out because they're "oppressed victims" seem to just be people who don't want to follow the rules like everybody else has to.

My wife had a good point too...if, as the shooter's brother claimed, he "went to war" with the city, somebody might tell them that in war both sides know it's a fight. This wasn't war, it was a massacre.