This should never happen. Bitcoin should do everything they can not be part of this type of wrong doings. Bitcoin is so popular and a lot of people preferred payment using bitcoin. That is why there are people who just wants to make easy money by doing something evil. I hate to say this but those pedophiles should go to jail if they participate on such things. A child's life should be meaningful and happy, this things should never happen. I am against this.
Even if it is happening i do not think that there is any fault of bitcoin in such situation, because if bitcoin will become totally banned, then they will change their payment method but are not going to stop the evil activities, therefore i think that government should try to catch the people who are involve in such activities, either they are using bitcoin or any other fiat currency.