Namo, what would you like to see done? How can we "morally" stop these people? Someone said call the cops when it happens, not have the cops setting them up (or words to that effect). If a child is under the illusion that this person loves them or is interested in them they will not see them as a threat and wouldn't call the cops. I think that parents should be more involved, but how do you as a parent keep tabs on everything that your teen does and not invade their "privacy" and make the kids get defensive? How do you keep tabs on what they do at friends' houses? You can't be there 24/7. My parents were extremely strict with me, but they still had no clue what was going on with me all the time.
This is a problem, and while it may not be the completely "honest" way to go about it, I would prefer these methods if it protected even one child.
"All the while making faces like a baby platypus who forget to take some Beano before eating a chimichanga." FindingNamo in reference to Jessica Simpson's singing.