You are 100% correct.
What the US military is doing, and has been doing for many years, is creating a long list of people that have legitimate grievances against the American empire. If a foreign power killed my friends or family I would hold that grudge for the rest of my life. I don't understand why so many of our fellow Americans don't understand that.
In many ways we were lucky with the aftermath of the war in southeast Asia. JFK, LBJ and Nixon killed millions of innocent people and as far as I know there was no blowback. Maybe that gave us a false impression of how the world really works. Revenge is a powerful human emotion. It will haunt our future generations.