Comment by wizzwizz4

… No, it's not the continuum fallacy: I'm saying that "the fixation index", and other such metrics, are irrelevant, except as far as people are racist. The sociological theory of "homogeneous population" is false, to the extent it was ever even meaningful.

More broadly, scientific racism is bunk. (This is a generalisation: I didn't establish it in my previous comment, but it's true nonetheless.)