Probably going to end up a very long post!
Cultural self interest is common in many countries - maybe it's worse in America, I don't know. I guess the major difference is that the rest of the world is forced to see their neighbours if nothing else, and most countries have many. The US on the other hand, is essentially on it's own (Canada and Mexico don't seem to count for some reason) bordered only by two VERY wide expanses of empty water. You can't take a half hour drive to a country that speaks a different language, uses a different monetary system, and has a visibly different culture in its dress sense, architectural style etc. I'm not saying this is an excuse for ignorance, but it's possible to see how easy a trap it is to fall into.
I'd describe myself as largely pro-American. Being from the UK, we've always seen you guys as cousins of sorts. A close ally in times of war, and a huge socio-economic influence in both war and peace. I fully realise the contribution the US has made to many areas of the life I take for granted - science, technology and many other things. And the fact I'm not goose-stepping down the street to 3rd Reich propaganda music (You’d never have come to Europe if it wasn’t for us, but we’d never have won the war without you). However, I am deeply worried by what I see as the current trends in your country. It would appear to me that you are turning away from all the good things you've previously been responsible for.
I can't speak much about Americans themselves, I don't know enough to make any generalisations without falling into the trap of popular stereotypes. This is probably very unfair on Americans - most English people are a long way from the old stereotypes of what an "Englishman" is, and the same is almost certainly true of most Americans. However, I can comment on what I see of the policy decisions, words and actions of the various faces of your vast government. Maybe this too is unfair on most Americans, however you elected them, and therefore they can reasonably be considered to represent the majority. If this isn't true, then you guys obviously don't understand democracy like you say you do - a democratically elected government is supposed to represent the wishes of the majority and you've got something seriously wrong if yours doesn't.
The US was once a beacon of scientific endeavour and it's application to political process and everyday life. Now, the administration refuses to accept the scientific consensus on many key issues. It applies its own form of religious extremist ideology, turning away from the enlightenment and back towards a much darker past where any attempt to "know the mind of God" was a heresy punishable by death. Such an extreme situation is unlikely to happen, but the refusal to allow scientific research, and the refusal to look at it's results, is almost as bad. The “Intelligent Design” issue is just one of many. From where I’m standing, this is almost exactly the same rhetoric as that of the Islamic Extremists it’s your newfound mission to eradicate. The only difference is in the choice of religion.
The US has always considered itself to be the ideal in terms of freedom of speech, of thought and of action. The American Dream - in the US anything is possible. Once this was verifiably true, and people flocked to the US, and were welcomed with relatively open arms at places like Ellis Island. Now I see frightening legislation, radical degradation of those freedoms. There is little patriotic in the Patriot Act, unless you count the ability to force, 1984-style, people to do and think as you wish, "patriotism". America, once almost the very definition of "multicultural" appears to be trying to force itself back down a mono-cultural route - and a fairly right wing, Christian white guy route at that.
There are still a lot of good things to be said for the US, and I know a lot of Americans are against the things I’ve mentioned (just two points of interest, I could probably go on for quite a while). My concern is that their voices of reason won’t get heard. Or that it’ll be too late for your country by the time they are. This is more from the point of view that I want you to be able to continue to be the ideal, the place the rest of the world aspires to. Currently that’s probably not the case – I certainly wouldn’t want to live in the US at the moment. Contrary to your own belief, the rest of the world could probably manage just fine without you these days. Sure we’d take a hit, some economies would crash, and trouble spots the world over would be down a lot of troops. But as important as you are, you’re not the keystone you appear to believe yourselves to be. However, as a country still with so much to contribute, why should we have to?