I wish I knew the answer.  Stephen asks if chemical castration has worked.
My understanding is that it has, but I don't know that for sure.

To my mind, if you have a person who can't help himself, who
can't stop himself from hurting others, then our first responsibility
in dealing with him is to protect his potential victims.

That might mean keeping him in jail.  It might mean some lesser form
of perpetual supervision (house arrest?  wearing a radio bracelet?
living in a supervised community?) or maybe chemical castration.

Our second responsibility is to try to be just to the person.  Some
pedophiles continue to commit crimes.  Some have thought about it
but are fighting hard to restrain themselves.  Keeping the first category
in jail for life seems just as well as protective of society.  But for the
second category, it's not as just and it would be desirable if we could
find alternative forms of supervision and/or chemical prevention.

One thing we can't do is let these people go unsupervised.

There's a famous psychiatrist at Johns Hopkins who specialized
in treating pedophiles.  He testified at our Maryland state legislative
hearings that psychiatrists should not be required to report pedophiles
to the authorities because then they might not come in for treatment.
It turned out that some of the people he was currently treating were
abusing children at the same time as they were seeing him and
telling him that he was curing them.

My wife testified in favor of  mandatory reporting.  She had treated
the victims as well as the abusers and had a whole different
perspective.  Reporting is now mandatory in Maryland.

   Alan