You might be right. It's probably simply that US is the biggest bully in the schoolyard...

That's where I think a lot of this comes from around here. Because the United States has been the leader for so long, everyone wants to point to every mistake, just so our heads don't get too big. You know what? Our heads aren't that big. We realize our mistakes. We realize our country isn't perfect. But the last thing we need is to be reminded of that fact, especially during a time when we're putting a lot of our reputation and stature as a world leader on the line.