At the risk of being ridiculed, I have long contended that it is not a conspiracy in the strictest sense rather than a condoned risk. There are certain factors which are taken into account and weighed against other costs. Initially, I believed that the Country could take a hit of 3 thousand dead and go right on without missing a beat. In fact, we did. Nothing really shut down. However, thousands of jobs were created in Homeland Security and the right wing conservatives went on a gleeful spree. Did the Administration set up the pilot training and actually shoot a missile into the Pentagon.....not likely, tho possible. More likely is the probability that those in power know that bombs will be thrown (as they have been throughout history) and have calculated losses versus profits and have implemented their plans accordingly. It all boils down to numbers, a concept indecipherable to the masses which is why the masses are controlled by the few.