I'm not saying I feel this way myself, but if anyone ever wondered why Americans are often stereotyped as self-centred and oblivious to the fact they are only a part of an international community, it's stuff like this which doesn't help them. However, I acknowledge that DNS and the Internet was originally just an American thing and wasn't initially conceived to service the entire planet, but still, we are living in the world we live in, regardless of the intent or lack there of.
As an American, I think that the reason we are stereotyped as self-centered and oblivious to the international community is that we are oblivious to the international community.
There are some extenuating circumstances. Compared to most countries, the US is really, really, big. So you can take a 2 week driving vacation, spend thousands of miles on the road, and never leave the country. So even people who have the disposable income to travel internationally may not have the inclination, because there is lots of stuff in the country to explore.
Second, the worldwide reach of the US entertainment industry and the prevalence of the rest of the world learning English as a second language means that we tend to assume that everyone speaks English, and that everyone is at least aware of our culture.
Third, there is a significant percentage of the population that subscribes to what is called "American Exceptionalism", which is the belief that the US is unique in all history as a force for good in the world. To suggest that the US follows it own self interest and that we are not always the white knight is viewed as unpatriotic and America bashing.
So you have people that rarely leave the US, think of themselves as better than everyone else, and expect that everyone else will learn English and conform to our culture.