Child molestation is something awful. I was raped at a young age by a family member and it's something that sticks with you, embarasses you, and brings you shame for your whole life. Sometimes, I find i'm over my abuse, and then, after 6 months of not thinking about it, something will happen to remind me of it and all the emotions from the abuse come back.
I don't think rape is appropriate in any situation, even to punish a murderer, nazi, whatever. With murder, you just die, but with repeated sexually abuse, you live dead.