My $0.02 worth on this subject:
The death penalty is not a deterrent. It does not reduce crime rates. It makes juries reluctant to convict. Crime is not out of control, rates for most offenses have been falling pretty consistently for decades. I am not prepared to kill another person except in an extreme case of self-defense or defense of those I love best, when there is no other alternative but him or me and my loved ones. But in general, no, killing people solves nothing, I won't do it and I don't want the state doing it on my behalf. I would rather pay the taxes necessary to sustain those people in prison until they die of natural causes. I'd let any number of murderers go free rather than risk killing someone wrongfully convicted.
In my public life I'm a peaceable man, live and let live, but in my private life... well, hurt my wife or children and you're going down as hard as I can make it happen. But away from the passions of such a moment, I say no, the death penalty as a result of a dispassionate judicial process is barbaric and I want no part of it.