How do you (or the FBI) tell the "good moderate muslims" from the covert Attas and Hadayefs?
Answer: you can't. You just have to wait for each explosion.
Have you ever heard the story about the two buzzards sitting on the tree limb? One buzzard turns to the other one, and tells him, "patience, hell, I am going to go out and kill something."
I just have this feeling that if those explosions begin, there will be quite a few impatient buzzards in this country. We saw incidents of impatient buzzards after the 9/11 incident.