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I'm generally a fan of "blurry" definitions where something can qualify as X if it fulfills a few of many criteria. I think trying to create hard rules around blurry areas like race and culture is fool's errand, and Scott does a great job laying out how overly strict definitions can go wrong.
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But then I have to press you: what exactly is this ratio, and how is it computed? How can I calculate it for various subspecies and for humans in order to verify independently that indeed, native Scandinavians and Aboriginal Australians are more closely related than any pair of subspecies of Chimpanzee?
And I have to point out that “subspecies” is a social construct too, in that the definition of subspecies is determined by biologists, who could very well define it as “subspecies are any subpopulations that have greater genetic differences than any two human subpopulations”. It doesn't tell you how to calculate genetic similarly, but it's clear that, by definition, there cannot be subspecies of Homo Sapiens, so problem solved. But of course that creates two problems:
That's hardly carving reality at the joints: it's plausible that there are relevant distinctions that are more fine-grained than you allow. If there really is no significant difference between human subpopulations, you have to show that from first principle, not simply assert it by definition.
Is this standard really being consistently applied? Again, think about the Chimpanzee subspecies. Are they really more differentiated than some human races? If biologists aren't using their own definition to determine subspecies in the first place, then appealing to the definition to assert there are no subspecies within the human race is meaningless.
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