Can you provide a link that proves that as I would be interested to read it.
http://www.amnestyusa.org/death-penalty/death-penalty-facts/death-penalty-cost/page.do?id=1101084
http://www.deathpenaltyinfo.org/costs-death-penalty
http://criminaljustice.change.org/blog/view/yes_the_death_penalty_is_more_expensive
In what way is remembering ONE of the ten commandments 'following the bible word for word'? And how could you possibly say that all of this wasn't his fault? Prisons in this country are near always full, and often people get released early because of this, and often these people are still a danger to society.
I'm saying that if you follow ANYTHING in the bible, then you should follow it all. You can't pick and choose where you like. You can't think "oh yeah, I agree with that bit", because then you're moulding your own values around that of the bible's, making the bible pointless.
It's not his fault because people's attitudes are a product of nature and nurture, i.e. genes and upbringing. A person's genes cannot be changed, but their attitudes (nurture) can be. Don't kill a person simply because they think differently; help them take on a different world-view.
Edit: The death penalty also isn't a deterrent. Most murders are committed in the heat of the moment, and thought doesn't come into it. Any other murderers are mentally ill, and need help.