Some folks just hate Bush, and can't see past the hate. If he says 2=2+4, they have to argue it's 5.
Others are in a way more "principled" and far more dangerous. they see themselves as "citizens of the world," and see the UN rather than the US as the chief guarantor of rights for humanity. they see the US and its "imperialism" and "capitalism" as the source of the world's problems; we are at best just another country with its own selfish interests or at worst evil incarnate because of its unique status and character. Simply put, they hate this country, and think patriotism is some sort of disgusting racist notion.
That's the sick mindset. It disgusts me beyond words, but that's what some think.
OK, I got the 2+2=4 wrong, but you know what I mean. :)