I agree. I'm not trying to defend this, but it doesn't sound like human trafficking. It sounds wrong and illegal, but who was trafficked? It seems like there were no actual children involved, just police pretending to be kids. But I could be misunderstanding.
Or they discovered more as they went along. With that wide of a sweep, I'm pretty sure the cops didn't find all of them by themselves. They likely flipped some and got the names of others.
I am probably wrong and the guy is just a sicko but what if he was reaching out to these girls to try to help get them off the streets?