45) Why is the death penalty wrong even for Malvo and KSH?

Here's the reason. Bishop Kalistos of the eastern Orthodox church puts it well. (I've been reading more about the desert fathers and so was reading his book.) He says

Because he or she is an icon of God, each member of the human race, even the
most sinful, if infinitely precious in God's sight. "When you see your
brother or sister", said Clement of Alexandria, "you see God". And
Evagrius taught: "After God himself, we must count everyone as God Himself".

Really, you can't forfeit this inherent value, and you certainly can't take it from someone else.

As for KSH, what I'd do is stick him a cell for the rest of his miserable life. But the special cell would be lacquered with all of the peaceful things Muhammad had to say about the Jews and their status as God's protected people.

KSH is as good an advertisement for Islam as Pat Robertson is for Christianity.