http://www.bbc.com/news/world-asia-37694475

It's an appealing idea, but maybe not.

i wouldn't waste money, just double tap with 9mm. end of problem ...

It would work if paedophilia was an inherited characteristic. For reasons that should be obvious, it isn't. Those who are abused are, statistically speaking, more likely to be abusers themselves later in life, but I doubt they're going to suggest castrating the victims as well as the perpetrators somehow.