still:
imagine a policeman at work: his boss says: "you will chat over internet and bring me sex offenders".... You would get a salary for doing it. Ok, my job is to chat over adult networks and pretend I am 12 and find out people interested in me. And also be sure the dialogue goes into a sex offending evidence. I have to say I am 12 and everything about my 12yo sex life to build an evidence and hope for a raise, maybe a medal.
So I still think this scenario only happens when a particular person is watched. Not guys like us who can be mislead by a young girl.
When I was in secondary school I had homework to do about how Police keep the internet safe. I however got the police to have an interview with me and they said police cant just watch what a random person does online, they would need something to go on. Something reasonable that says they should investigate someone.