It's not okay when a criminal gets a short sentence, gets out and kills again, but that doesn't mean the obvious solution is to kill the poor bastard. Killing someone to guarantee that they can't possibly commit another crime is basically admitting that our justice system sucks so bad that we actually have no clue what to do with these people. It's a blunt solution that will keep us way behind other countries in terms of dealing with criminals.
I don't get how you guys can see the US up there on the list with those other ass backward countries and not think, "hey, maybe there are some smart folks in those other western countries who came up with a better solution." We need reform, people in this country are so messed up.