Mark Schmitt wrote on this phenomenon today. Pull quote:
I am, I admit, more concerned about what my country does, how it conducts itself, how it lives up to its unique aspirations than I am by something that happened to [9/11] our country. That's not alienation from my country; it's patriotism in a democracy. It's the belief that we bear some responsibility for the actions of our country, and even if we opposed them, we should ask what more we could have done.
Read the rest here.