It's so very sad that people try to make this some sort of patriotic thing. It's a sport, a GAME, and a victory, or group victory, says nothing about a country. The only reason the best in the world are selected by country is that it's the easiest way to do it.
Once the world's best are on the track or field, their competition is purely personal; that is the essence of sport. Wariner and the other runners aren't paid by the same people, they don't train together, they just happen to have the same citizenship. But they could all have been from different countries, and ended up in the same places in the same race. So why try and make something political out of it?
Now, if you want to complain that Wariner didn't go back and shake the hands of all the other competitors, go ahead. But his competitor's citizenship has nothing to do with it.