WOW - talk about taking verse out of context! There was nothing that this guy did that was “good” or “pleasing to God”!
The man is not reported to have repented. This he needs to do to save his soul. And even if he does, he needs to be separated from society until the day he dies. That means "life without the possibility of parole," or a just death sentence which is carried out in a ways that is swift and certain.