I will go on a limed ( sorry for spelling !) on this one.
I will first say that I am against the death penality.
Secondly , I am not a believer.
But , it is my understanding that ( And I am making a generalisation here) that most conservatives are pro-death penality and most liberals are anti-death penality. I will then generalise by saying that a lot of conservatives are christians , as in " the USA is a christian Nation". That would suppose that , for the USA , God should be the one ultimatly decides who is wrong and who is right. We can makes laws that will put away criminals , but ultimatly , it would be god who will judge. It is not man job to k kill ! " You shall not kill" is a pretty strong commandment , and a lot of christians would want to have the ten commendmants displayed in public spaces , like court houses and city hall and school. I am not a believer and think this commendment is one of the most important in the book ! If it is a commendment , comming directly comming from god , who are you to decide ( a christian jury , a christian judge , achristian citizen , a christian governor) to decide to againts God will and kill someone ?