Our judicial system is seriously flawed, to ever release some of these types.
I am involved with a non-profit, and we have many visitors, including predator types. A recent incident involved a registered sex-offender, that acts as if nothing could stop him, short of permanent lock up.
It has been concluded by mental health experts, that pedophilia is an incurable condition. Once a pedo, always a pedo.
I think the same is also true of "confidence" types. They will manipulate themselves into positions of authority, respect, etc. Then do their dirty deeds. Often victims feel ashamed and guilty themselves, do not report.