Nothing has happened to raise doubts about the American loyalty of the large and diverse Arab-American communities. Any baiting of Arab ethnicity at this time is offensive and stupid, and plays into Saddam Hussein's hands.
Whatever is wrong is not made right by fears of terrorism. Saddam Hussein keeps saying he will unleash it, and perhaps he will. But if his mere saying so provokes responses against innocent people, he has won that battle. Terrorism is, indeed, a possibility. The Iraqi dictator was a sponsor of it before, and several terrorist leaders have gravitated to Baghdad as other sanctuaries have closed down.
Terrorism is on the retreat worldwide as the countries of Eastern Europe have dropped support and as Libya has shortened the reins and Syria has cleaned up its act for now. That does not rule out the use of personnel and supplies in place for a spectacular or two. Professionals in this field have always shown a willingness to change masters.