The Government needed a crisis to convince the people to willingly give up their liberty in exchange for safety.
"Enjoyed this as much as I did the book it somewhat follows. Never have believed that the amount of planning & people that this took, could just slip into the USA & do what was done without the prior knowledge of at least one or more government agencies. The movie does NOT lead you ,it meanders in & out of events allowing for YOUR conclusion. It is immediately obvious that the government would not want this movie out in an educated public, which is why they have spent years & lots of $$$$$$ to make America as stupid as possible so they can be led blindly to slaughter. "