Killing someones life is against to the Biblical laws or in a God's Law. We Borrowed our life to our ather Jesus Christ therefore, we dont have any rights as a human to take away that gifts from God. But Those Henious crimes such as killing, taking away someones dignity are sometimes punishable by death. But Government itself shoul not have right to kill someone. Death Penalty has no room for forgiveness but to God, There is always a second chance
Bible is just a set of rules that even the Christians don't follow. Do you really believe that all the soldiers who fought and killed in various wars weren't Christians? Or that all the people that work in the penal system aren't? Many of those judges who actually sentence people to death go to church and find it justified to kill others.
I personally think that some people don't deserve to live. Especially mass murderers or child rapists.