Americans long to be united. After 9/11, we all just wanted to be one nation. Not a single American on September the 12, 2001, cared who won the next presidential election.
Our paradigm now seems to be: Something terrible happened to us on September 11, and that gives us the right to interpret all future events in a way that everyone else in the world must agree with us. And if they don't, they can go straight to hell.