I dunno...everyone has their kink. Some kinks don't hurt anyone(cool), some hurt unconsenting, innocent people(not cool at all), and some hurt no one but the person themselves(uncool, but not the government's business).
I figure if these castrati were willing and consenting, there shouldn't be a crime at all. Are they messed up upstairs? Probably.
I have nothing against doing what you please to get your rocks off, provide all are consenting adults, but NO one is gonna tell me that any man would consent to castration without some kind of coorsion