[bnjemian]

Here's the thing you may be missing: The complete diversity of human phenotypes (including what is socially discussed as 'race') is almost entirely present on the African continent. If you believe in evolution (and I'm assuming pretty much everyone here does), that makes a whole lot of sense – humans migrated out of Africa millenia ago and, as they moved to different environments, preferential selection for certain traits that already existed within the migrating population(s) occurred. There may be some traits that are beneficial and passed on due to spontaneous mutations post-migration, but they are relatively few and typically present in superficial features (e.g. eye color, hair color).

[dotancohen]

Your argument seems to support the notion of race, not counter it.

Italy builds many classes of cars. We still classify them as luxury vehicles, sports vehicles, economy vehicles, etc. even if some parts are interchangable. The Lamborghini Diablo used passenger bus taillights.