But I partially disagree with you that 911 had not been useful for the Iraq, Libya, Syria and Yemen wars. The usefulness has been twofold, by establishing the machinery for widespread surveillance and by creating a general background fear of state assisted terrorism that paved the way for attacking states. Remember the demonisation of Saddam started with the Anthrax attack after 911 and the attempts to link it to Iraq. Then there was a lot of misinformation that Saddam had secret ties with AQ. As these failed to convince the politically savvy, I am sure there are many in US backwaters who still believe these stories and it created an air of negativity. It also served the blue print for future attacks: multiple accusations are thrown in and hope some will stick.
But the most amazing fact that emerged out of the warped neocon mentality is that the US is now firmly allied through its proxy NATO allies to the same organisation allegedly responsible for 911, in Syria and Iraq.