This will only result in more deaths of children because the rapist will have no reason to let them live since they will die either way. If sparing a rapists life also spares the life of their victim then it's worth it.
I hate having to agree with this but it is true. To me the paedophile is the lowest form of life on this planet and I would just lock them up with the other prisoners rather than keep them in their own safe little section, let Bubba and his mates deal with them.