So because of a few men in robes, we can’t kill those who torture and rape children.
It’s unlikely we can convince them that child rape is a bad idea. Probably as hard as “curing” homosexuality. (I don’t think sexual orientations are easy to change.)
So now that we can create mice with Asian hair, and we know personal DNA samples change over a lifetime anyway, why not direct that change in a way that can cure people and turn criminals into good citizens?
Bonus points if you can give a good reason that doesn’t rely on time travel (believing we can give someone back lost time), analogies to the National-Socialist German Workers Party, or revenge.