Back to the Kenyans. I think genetics is one factor, by no means the deciding one,(if there is a deciding factor,) in a continuum that makes Kenya produce superior runners. However, even if it is less important than altitude, work ethic or diet, it is still a factor, but no reason to cry Nazi.
Also, when talking genetics, people like to draw analogies from dogs. Dogs are a wonderful example of evolution, but not natural selection. There's been a lot of UNnatural selection at work on Fido, or he wouldn't look so screwy! So humans and dogs are not %100 analoguous.
If it's so racist to point out genetic biodiversity, is Nature racist? Why do you think we look different in the first place?