If you punish a cobra and let it go, it will bite someone else. When a psychopath with sadistic sexual urges goes into jail, and comes out, he is still a psychopath with sadistic sexual urges. If he liked children going in, he will like children coming out. This is not rocket science. We need to get a handle on this.
Sex is bizarre, and it is powerful.
The normal variety is odd enough, but harmless. He is what he is. Certainly there is nothing in prison life that is likely to make him suffer a sudden access of morality. He pled down to breaking and entering and assault and got a couple of years of probation. Breaking into a car to get at a little boy isn't a property crime.