I think the reason they don't is because it's spook-world stuff. Consider the story about the nice people in the Phillipines. The Filipinos merely kicked them out of the country, but we're not told what happened to them after that -- I doubt we'd be dumb enough to just let them get lost in the crowd.
Or the Atta meeting in the Csech Republic, which the US is allegedly not pursuing. Really? Or is it just a matter of not pursuing it publicly?
Personally, I think there's a whole lot of stuff going on in the shadows. I hope we get to hear about it some day.