Assume the official story is Gospel. 19 men mostly Saudi's who could barely fly a single prop plane executed complex banked turn approaches and precisely slammed 3 aircraft into buildings with the same skill you have parking your car in a garage. The twin towers pancaked perfectly and burning jet fuel turned steel molten. (Jet fuel burns 1000 degrees cooler than the melting point of steel) The black boxes where never found yet one of the hijacker's passports was conveniently found at the scene.
Unlike Pearl Harbour the people who failed to stop this plot where not fired, or demoted no they were promoted. Instead of attacking Japan the US went after the equivalent of Taiwan.
Now the world is locked into a surveillance state, permanently occupied by endless Orwellian war with no idea what victory would actually look like.
Operation Paperclip, Operation Highjump (Southpole Nazi War), Roswell, JFK, and 911, the great mysterys that define life on earth as we know it today. Ironically, no one who could wants to solve them.