actually I've seen some where were it shows it is cheaper to keep them alive than put to death, I thought it was cheaper to kill them but it's not. I'll keep looking, it was the appeals for the death penalty inmates that drives the cost way up.
either way, i say keep on executing them. I listened to an interview a guy had with this guy and he showed no remorse or ever said he was sorry for what happened. The group even bragged about it that night at one of their brother or cousins.