I've come to the conclusion that many such cases of "mental illness" are actually calculated perversion.
Following the example of the gay and lesbian civil rights groups, pedophiles are organizing politically and have as their goal the passage of laws LOWERING the age of consent for sex. Some want it to go as low as the age of ten. The proponents of this movement can be surprisingly intelligent and persuasive...at least to those easily swayed by spurious civil rights arguments.
Their numbers are growing...and given the tendency of some Americans to be taken in by trendy, politically correct, civil rights fads, this movement could...could, mind you...pose a long term threat to the laws which protect our children.
Don't dismiss the idea out of hand. Child sexploitation and prostitution are legal in many foreign countries. The key to the modern pedophile argument for legalization of sex with children is that they are "individuals" and are fully capable of making their own choices in such matters. If they repeat this often enough and long enough they will begin to convince those who have a weak moral compass.
As to castration...why not? The sickness "may" be in their heads, but in many if not most cases they are simply sexual predators who know exactly what they are doing and that it is illegal. Their predation may be the result of an abnormally high testosterone level, which heightens their sexual drive, leading to the predation. Surgical castration brings about a permanent reduction in these levels, ending the predatory lusts of the perpetrator.
Chemical castration isn't a proper control for the problem because it requires, in most cases, a willingness on the part of the perpetrator to "take his medicine." Many refuse to take it regularly because they WANT the sexual high and the thrill of sexual conquest.