Cat Stevens - Potential Terrorist

Oh, for Christ's sake. Yusef Islam, formerly known as the pop singer Cat Stevens, was pulled off (in Bangor Internation Airport in my old stomping grounds) a transatlantic flight and denied entry to the United States because it turns out that he's on a TSA watch list. Of course, it would have been perhaps nicer if they could have figured this out before the frigging plane was in the air! How does Cat freakin Stevens get on a terrorist watch list? What is wrong with this picture? Hello? McFly? Hello? [article]