There is a program RSA (Redirecting Sexual Agressiveness) that is offered to some cases that seem to have the potential for being productive, non-threatening citizens. They are very strict and have a successful program. I personally know a man who went to prison for exposing himself to children of both sexes and for fondling female children. He is one of the most spiritual, kindest, intelligent, most sensitive people I have ever met. He knows he has this addiction and follows strictly the principles he was taught in RSA. He had determined never to have children or be around them and never allows himself to have destructive thoughts. He's looking for a woman with whom he can share his life, and I think she'll be lucky to have him.
I'd be curious to know if anyone else knows a former abuser who has become a blessing to society. They're not all the same. Every case is different, and we shouldn't be automatically afraid or disdainful of someone we discover in our neighborhood. You really have to know exactly what the person has done.