It's a nice idea, radio_flyer, but we can't get them all. Even if we could eliminate every single one that exists today, more will be born. They're not always the result of abusive or bad parents; sometimes they are born that way, or maybe predispositioned towards it, and something happens that brings it out.

And they're not just in the US. In some countries, it's legal to marry young girls. Even when it's illegal to have sex with children, sometimes the law enforcement permits it (usually because the bad guys pay them to).

And, yes, while the predators are the real ones to blame, that doesn't give parents the right to ignore their responsibilities. A man isn't to blame if he gets robbed because he allows his money to hang out of his pocket; that doesn't give a thief the right to take his money. But we know there are thieves out there who will take advantage of such a situation, so it is best to be a little careful and make it less easy for the bad guys to take advantage of the good guys.