So apparently Miller's political change, on foreign policy at least, was a direct result of 9/11:
http://en.wikipedia.org/wiki/Holy_Terror_(graphic_novel)#Development (I was actually waiting for this to come out and apparently it has, but it doesn't look like there was much talk about it at all. Maybe I'll check it out)
For the first time in my life I know how it feels to face an existential menace. They want us to die. All of a sudden I realize what my parents were talking about all those years. Patriotism, I now believe, isn't some sentimental, old conceit. It's self-preservation. I believe patriotism is central to a nation's survival. Ben Franklin said it: If we don't all hang together, we all hang separately."