'What evidence do you have, other than your imagination?!?'
None whatsoever. My theory is just that: a theory, an educated guess, a probability based on our current world situation.
I'm not one, however, to just ignore the likelihood that we are being watched. Not like McCarthyism with a commie behind every tree, but by patient, intelligent people who are either being well paid or are zealous enough in their religious beliefs to want to harm us. The fact that the British caught these people in the UK preparing for an attack should indicate that there are plans afoot. Or the person arrested in Germany for putting a bomb on the train that did not go off. These people are out there.
Al Qaeda is a cancer, and we are helping to spread it with our foreign policy. But I still don't want to see anymore people of this world get killed by religious whackos who think that killing people who believe in a different fairy tale is a morally sound thing to do.