Think your government is above deceiving you? Above killing innocent people to do so? They’ve been planning such operations and carrying them out for generations.
In 1962, the American Joint Chiefs of Staff signed off on a plan to blow up AMERICAN airplanes (using an elaborate plan involving the switching of airplanes), and also to commit terrorist acts on American soil, and then to blame it on the Cubans in order to justify an invasion of Cuba. Remember this before ridiculing “911 truthers”. People in our own government have been planning something not too unlike 911 since at least the early 60’s.