I'm sure the FBI has to be really careful about how they approach something like this. Cases have been thrown out because the judge ruled that the FBI was engaging in entrapment. The FBI has to be able to prove that the perp was actively seeking a meeting and wasn't just being led on.
I personally don't buy the entrapment argument in a case like this. Even if the agent posing as a young girl was trying to initiate a meeting, a guy should have the discretion to say 'No, this is wrong, I shouldn't be doing this.'
Why should FBI agents be any different than anybody else? Does anybody tell the truth on the internet?
Except for me. I really am Harrison Ford's much younger and more handsome brother. Richer too!