Actually, one could argue that human life is more valuable for an atheist, since they believe there is no afterlife so when someone is gone, they're gone. However, it is, as you say, off topic.
Regarding the death penalty, as others have said the purpose of the justice system is not to exact vengeance on behalf of the victim. Of course, if someone I love were murdered, while I would hope I would have the strength to forgive the murderer, in truth I would probably want to kill the murderer in revenge. However I don't see why it's the job of the state to exact that revenge for me. If I were sufficiently determined to exact revenge, I should be willing to do the job myself rather than expecting someone else to become a murderer in cold blood for me. If I truly regarded that prison were not enough of a punishment, doing a prison sentence of my own for exacting revenge would surely be a small price to pay.
The state has already done its job by locking the guy up for life, thus preventing him commiting any further crimes.
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