Due to the appeals process, it's actually cheaper to sentence someone to life in prison than it is to give them the death penalty.
If he gets life, he'll he in protective custody. That pussy wouldn't last 15 minutes in general population. Some things aren't even acceptable to the scum of society. Crimes against children first and foremost, but I think shooting up a theater full of innocent people would qualify as well.
I never knew it's cheaper to give him life in prison than the death penalty. I say let his ass rot in prison for the next 50 or 60 years. There's no doubt he'd be dead within 10-15 minutes when he's put in general population. As soon as those gates open up he'll get beaten/stabbed to death. That's a MUCH cheaper death penalty.