I used to be a big proponent of castration for rapists until I talked with one friend of mine which worked at the police sexual crime unit. It has been proved that once rapists are castrated, they turn from sexual assault into murder, since the venue to "release" their animalistic impulses has been cut.
When asked about what to do about them, he told me that sexual offenders must be constantly monitorized, for theirs is a permanent, genetic, non reversible condition, pretty much like psycopaths. They cannot be rehabilitated, ever. Which makes me question my opposition against death penalty. After reading cases like this, it makes me question my opposition agaisnt death penalty by disembowelment carried on by rats as well.