Castration is letting the perpetrator get off too easily.
Short-term pain only. And who can be certain he won't get back to
his criminal ways again?
He will not have to resort to rape: he could use his hands, other
tools, etc, to physically abuse his victims.
A simple injection of double concoction of syphilis and gonorrhea
into his member should ensure his pain lingers on forever.
Well, at least, each time he pisses, he will get a very sore
reminder.
