I don't have any sympathy for people that prey on and vicitimize other people, teenagers or otherwise.
That said, I think the show itself is pretty despicable. Just explotative fear mongering at it's worst. You mean if underage girls on instant messenger invite strangers over to their house to have sex there are men out there who might be interested?!?!? STOP THE PRESSES!
There really isn't any defense for the stupid fools who take the bait, and I'm sure many of them are legitimate creepy sickos... but borderline entrapment for the sake of ratings is plenty loathesome in it's own right.
A high-school buddy of mine had to register, for many years, as a sex-offender. His crime? He had consentual sex with his 16 year old girlfriend a week after his 18th birthday. By that definition, I was sex offender as well about 15 years ago. There is a point where fear and "zero tolerance" destroy rational thought... and trying people in public court for the sake of ratings doesn't help.