Not from New York...
Some say that they can't believe 9/11 was an inside job because too many people would have to have been involved. Don't believe in big conspiracies in government? You apparently are not from New York.
Anyway, here's how big conspiracies work: the foot soldiers know a little something, but not much. The top plotters keep information compartmentalized.
If you don't believe in big conspiracies, I'd like to ask you how communism took over half the planet prior to the Soviet Union's collapse.