I don't. It does absolutely nothing to reduce the problem and seems to come from the old belief, that you stop having sexual feelings or urges when your genitals are cut off.
In truth that just means they will have to find other ways to hurt, dishonor and mutilate children.
Pedophiles must be locked up for life. There is no cure.
And since this is not just perversion but an actual sexual orientation (like homosexuality or heterosexuality) in some cases, while it is an uncontrollable urge in others, castration won't even have a deterring effect.
So yeah, I would say that this is a waste of time and resources. Just lock them up for life, because our children must be protected from these people.
The sad thing is, that the big majority of child abuse cases takes place within the confines of the family home. Fathers, uncles, brothers and grandfathers. But how can you protect your kids from that?
You can't really and I find that terrifying. All we can do is lock up known offenders for life to at least reduce the risk of abuse by strangers.