Good point Smalltown, but it seems that after 9/11 a lot of people began attributing a lot of unfounded behaviors to Al Qaeda and other terrorist groups that have no foundation in reality. They tried to make Al Qaeda out to be an invading army, which attack and reattack, instead of the terrorist group they are. Terrorists send messages, they don't conquer territories. Al Qaeda got its message out on 9/11, and now they're paying the price for said message. All this panic about attacks is a lot of panic and paranoia run amuck.
I still say that the biggest indicator that the Al Qaeda boogie man is a lot of hooey is the lack of attacks during the invasion of Afghanistan and in Iraq. Not one news show failed to point out how a major terrorist attack in the US would destabilize the Bush administration and cause the US to rethink attacking Middle Eastern/Islamic countries. Talk of this subject was everywhere. On top of this, there is nothing more valuable to a terrorist group than a country where they can plan and operate with impunity. If there was ever a time to attack targets within the US it was when we invaded Afghanistan, and yet not a single attack was made. That tells me all that I need to know.