The big argument of anti-(death-)penalty advocates is the arrogance of punishing other human beings, or even killing them. What gives us the right to do this? Are we really in a position to judge? The best answer to this is to turn the argument round. What is really arrogant and sinful is to assume the prerogative of mercy. Who among us, ordinary mortals, especially if we are not the culprit’s immediate victim, has the right to erase another’s crime, to treat it with leniency? Only God himself – or, in state terms, the very pinnacle of power, king or president – has, owing to his exceptional position, the prerogative of erasing another’s guilt. Our duty is to act according to the logic of justice and punish crime: not to do so entails the true blasphemy of elevating oneself to the level of God, of acting with his authority.
I don't really agree with this but it would be interesting to think about this in reference to Camus' essay on the death penalty, in a--dare I say it--dialectical way