Pedophilia is genetic. It has been around forever and will be around forever. You can kill every pedophile and there will be a million more pedophiles in the future. It's just part of the human race and the evolved brain. Dolphins also engage in rape and child rape..
Maybe someday there will be antenatal testing to find things like autism (which i believe is linked to pedophilia) and pedophilia and people can chose an abortion like they do with down syndrome cases. Really pedophilia is so bad even if you could only discover it after birth in youths, maybe one day it'll be legalized to put kids down who show signs of devloping it.