Spymaster
Plastic Paddy
I agree with this. It seems eminently fair and just that the father in particular lives in fear for the rest of his life.
I think this is where people lose their way with this.
What you're trying to do here is draw an equivalence to the crime. You want him to feel fear for he rest of his life because that's what he made the child feel. However, to subject him to that is lifelong torture, which I don't necessarily have a problem with, but I struggle to see how it's more humane, or reflects better on society, than a swift execution.