Who is to say he was setup at all? Perhaps just another run of the mill pedophile in making caught in a sting.
If that's the case and it seems the most likely to me then the question is who was involved in keepitng it quiet.
As for who is leaking the story now, I can only say that I am sorry it isn't me. Any troll surfing for children deserves all the public recognition he can get.
But if your asking could it be political payback from the right, absolutely.
Perhaps he wasn't "set up" but was simply caught engaging in this disgusting behavior.