It’s pretty basic harm reduction. We support harm reduction. A terrible person being killed is harm reduction even if a terrible person being imprisoned and being rehabilitated if at all possible and made to be as productive of a member of society as possible in prison would be better harm reduction. The world is too big and too awful to look at everything in absolutes.
And it’s nice to see awful rich people actually get the real punishments they often deserve instead of poor people get those punishments that they often don’t deserve.