I've seen a lot of vile and sick things in my time on these forums, but this is one of those that, if not number 1, then in the top 3 to be certain. And it takes a lot for me to consider changing it from the Pearls and Ronald E. Williams. They should be thankful that aggravated child rape, especially of their own kids, doesn't carry the death penalty regardless of the protests of many.
If they're guilty of it, I'd throw the switch, and given my usual misgivings on the death penalty, I would never say such a thing lightly. May their kids find the peace and serenity they so desperately need.