However, the true wins will come by doing real-world police work, educating parents and children on how to protect themselves and what are the potential offender profiles (hint: not guys in an ice cream van). They will come on a diplomatic level by negotiating better laws in countries where such materials are produced (Japan was a recent success AFAIK) and where sexual tourism is rife.
Finally, those individuals that haven't abused anyone should receive support from a mental health specialist if they come forward and admit to their urges, like in e.g Germany.
I have the feeling that this is a taboo subject, that is not discussed frankly in most societies. The authorities focus mostly on harsh punishments instead of prevention through education and mental health treatment.
Thinking about what happens on tor is mostly a reactive policy that doesn't do much to treat the causes.