Yes it became prominent after 9/11 … but that kind of behaviour has been going on for a century and more distinctively after the Second World War
Look up the history of Allen/Foster Dulles and their work for American Corp in the 20s and 30s … their enthusiasm for war in the 40s … and then with the CIA in the 50s and 60s … the actions of which led to what happened in the 70s and 80s … which later on affected what happened in the 90s and 2000s. It makes you understand that even if the US people don’t want a war … those in positions of power and wealth enjoy war and conflict because it makes them money and spreads their power. We accuse other nations of doing the same but America does it while draped in a democracy flag and an ugly tattoo across their forehead that says ‘freedom’.