I'm guessing the address to find the underage child wasn't released until the accused made it clear what they wanted, what they wanted to do, sent pictures (probably explicit, etc). Lets be honest, in most of these cases, the police know what they can and cannot say/do to avoid the entrapment clause.
To the one accused who said he was trying to talk her out of it, I call it what its, bull. When I was younger (24), a kid (aka Greg) who was 14 started to talk to me on gay.com. I made it clear, I had NO interest in him (sorry, not into children) but I'd be happy to talk to him (he had questions about being gay, etc.). He told me about meeting up with this 30 year old guy, who knew his age and they fooled around and were still meeting up occasionally. I was livid, not at Greg, but at the 30 year old. The kid tried to explain it away, that he initiated it, etc, but it didn't matter, the 30 year old guy should KNOW BETTER! He wouldn't tell me the guys name though (I would have no issues reporting it if I did). However, I was pretty rough on Greg and I had thought at the time I was helping make a difference in his life, even though it was just talking via text chats. Eventually he stopped talking to me, he was growing up and he also got annoyed a few times about how tough I was.
Now, many years later, I met Greg in person at a local club (he's 21 now). He realizes I was acting as his big brother now, trying to help him be a better person. He isn't the most well rounded kid and I think he's dealing with some of the issues from when he was younger. That said, I think I did help make a difference as he told me he stopped meeting up with the guy shortly after we started talking. He came out to his parents and started focusing on himself and trying to become a better person.
In short, I'm sorry, these guys knew what they were doing was wrong, if they really wanted to help the "kids" they would have tried to talk to them as adults, as mentors; not as sex toys.