Weaste, the thing is that if there are no similarities to draw from between us and those competing, then what stake do we have in the Olympics? None I suppose would be the answer. Well personally, if I don't have a stake in something, be it emotional or ethical or absolutely anything else, then why the feck would I give a shit?
Sorry but I don't buy your whole nationalities argument for a second. Maybe the athletes don't care at all about the fact that they're representing America in that given moment when their energy is being poured into their event, but when they speak and how the act would suggest otherwise.
Also, as for your comment about how Americans don't exist, it's an argument with no right answer. If Americans don't exist, then British don't exist, or Russians or Norwegians etc... and we would all just be descendants of evolving central African apes and what not. But central African apes don't compete in the Olympics, and in the societal norms we live in, Americans do, and that's something I have a stake in because I was born and raised in this country.
Trying to defy the notions of nationalities and that there are in fact no similarities between the citizens of a given country (or at least no more than the citizens of other countries) is actually quite bold and either Utopian or Distopian, not sure which... but it doesn't matter. Because we live in the year 2008, I'm American, you're well... whatever you are, and that's how the world views us.
I may have completely missed your point but that's okay because I'm American, and that's what we do best.