Such a man certainly deserves severe punishment. So cruel to a child who was young and blameless. Never to be released is appropriate.
Same as slobbering executioner volunteers or vigilante posse members - jail in large amounts. They're criminals too - or would be ones.
The more draconian the penalty, the more likely perpetrators will kill their victims.
Some people act as if the punishment is more gratifying to them than preventing the crime. They want to inflict suffering and they use wrongdoing as an excuse for their gratification. We'd be better off without the criminals or the armchair executioners free in society.
