It would be more torturous to leave them to rot in jail forever anyways.
I would rather that happen.
Life is precious, after death is nothing, pitch black, unconsciousness. You're no longer a part of the universe, you're nothing, you never will be anything again, your life is over and only what you've left behind survives. You'll never laugh, smile, or greet a friend again. Just nothingness, the human experience is gone, and you'll never love, care, or comfort somebody ever again.
How is jail worse than that?