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I would agree that genetic diversity is a good thing, but mother nature tends to weed out those whose genes are a little too diverse - in other words, those who are unable to survive. This is why there is a very low incidence of albinos in nature - where an animal's fur or skin is its camoflague, to be pure white as snow is to be damned to a very short life indeed.
Where as the rest of the animal kingdom has the equalizer of nature, humanity has cancelled this out with civilization and technology - and the genetic diversity we would have in the state of nature, it seems, has been blown out of proportion.
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