Paedophilia is a difficult one. It is a recognised mental illness and has been for donkey's years. Places like Brockhall and Calderstones used to be full of paedophiles. It is incurable and I highly doubt that chemical castration will work long term, even on a voluntary basis. Drugs
always have side effects and the more powerful the drug the more unpleasant the side effects usually are. I think that even voluntary candidates for the drug will get fed up with the side effects and eventually stop taking them.
There is no easy answer to this problem, let's face it, it has been a problem for hundreds of years, if there were an easy solution it would have been found by now.
It would be great for parents if they knew where the paedophiles were, but if people were informed of paedophiles in their area then the paedos would just move on and the police may lose track of them. Let's face it, it is not hard to disappear in this country, thousands of illegal immigrants manage to do just that every year.
Historically, most sexually abused children are abused by somebody they know, whether it is uncle Albert, aunty Betty, a neighbour or friend of the family. To my knowledge, this is still the case..
As I said, there is no easy answer.