As for our own kids/grandkids/nephews/neices/etc, I think the best way to educate them to prevent bad things from happening is to teach them a lot of common sense situations. Children are much more likely to get molested (and kidnapped) by someone they know. The idea of a creepy guy driving around in a van offering kids candy is strongly ingrained in our heads, but realistically the most likely ‘risks’ come from the people that are closest to our children, not strangers.