New 9/11 Plot?

I found this article from CBS News interesting. It concerns a Saudi Arabian citizen named Rayed Abdullah. Abdullah is the former roommate of Hani Hanjour who, as we all know, piloted the plane that flew into the Pentagon on September 11th, 2001. Abdullah was also taking flying lessons in the United States, and was one of the terrorists named in the now famous "Phoenix Memo," which warned, two months before 9/11, that al Qaeda might be planning attacks against aircraft in the U.S. Abdullah was never charged with anything related to 9/11, and later left the country.

Since then, he has entered New Zealand, with a false passport and name, with the "intention" of studying English. After entering New Zealand, he applied to several flight schools, and tried to get a commercial pilot's license. He ultimately was arrested and deported from New Zealand as a "national security threat." He returned to Saudi Arabia, where he was detained and released. He has, since then, vanished.

So my question is this: why is this scumbag still breathing? Why hasn't Delta, or the CIA, or a CAT unit killed this guy and spared us whatever sick and twisted evil he may be planning? We have seen more al Qaeda messages of late, are they trying to re-assert themselves in the midst of the turmoil in the Middle East, or are they signalling people like Abdullah?

Maybe Abdullah has since re-entered the U.S. through our wonderful southern border. Or maybe his "vanishing" act is more than a coincidence. Maybe the Saudi's did us a favor and sent him along to his blessed virgins.

Whatever Abdullah's ultimate fate, we need to be much more proactive in dealing with these people. When we find them and their intentions are clear, overt act or not, we need to apply the "ounce of prevention" principle. Kill them, not capture them. That way, we don't offend anyone by sending them to Gitmo.