Obviously, people here have no history and political knownledge.
Vietnam, Operation Northwoods, Chili 1973, Iran-Contra, Bosnia, Operation paperclip, etc.
On the technical side;
http://patriotsquestion911.com/
220+ Senior Military, Intelligence Service, Law Enforcement, and Government Officials
400+ Medical Professionals
1,200+ Engineers and Architects
250+ Pilots and Aviation Professionals
400+ Professors Question 9/11
300+ 9/11 Survivors and Family Members
200+ Artists, Entertainers, and Media Professionals
You don't even have to waste your time on the technical side of 9/11 to understand
why it was required, if you are not lazy and study for 2-3 weeks how this world works.
https://youtube.com/watch?v=iRh5qy09nNw
https://youtube.com/watch?v=bBlOX3PaVKs
Leemings.