It comes and go in waves, but it's pretty crazy what an appeal to an old bogeyman can get you; at the time, George Bush talking about a "clash of civilizations" and appealing to old Crusades era mythos of east vs west, orient vs "western civilization" etc. was incredibly "successful" at accomplishing the goals that Rumsfeld and Cheney and others had set out for their regime.

The Bush/Cheney regime inherited a largely liberal, tolerant, and centrist populous from the Clinton years. The general zeitgeist and political atmosphere from back then looks so civilized and calm compared to now. And they leverage 9/11 to stir up a whole different scenario afterwards that has never stopped accelerating. The xenophobic far right has been in steady ascendancy ever since.

To this day, if there's a shooting in a mall or whatever, you'll hear people immediately jump to the jihadist explanation, even when it's clear that the bulk of terrorist type violence in North America doesn't actually take this form -- it's usually far right / white supremacist in inspiration, just as it was before 9/11 (e.g Timothy McVeigh, etc.)

I'm an atheist and no lover of any organized religion, including Islam, but it was dark and depressing to watch at the time and it continues to be depressing to see people manipulated on these terms.