To training all of the parents in the world and train all of their children is an impossible task.  Take heart.  We can start with you and yours. 
Prevention is not attempting to drive the fear of God into the Godless.  We have to stop trying to frighten people into moral compliance, but rather focus in a positive manner on our children to instill confidence and right thinking into our young.  This serves to make them more difficult and less likely targets for the pedophile.