There are witnesses who say there were plans at the Pentagon to invade Iraq long before 9/11. And, indeed, there were warnings about Arabs taking flying lessons as well as warnings about plan of flying planes into the towers. The powers that be refused to accept those warnings. After the fact, it made some sense to invade Afghanistan, but no sense in invading Iraq . . . not over 9/11. If we'd wanted revenge on the country that had the most citizens involved in the highjacking, we'd have invaded Saudi Arabia.