"This is how the PC establishment thinks. If there is a conceivable way to twist and distort what is said so that it can be labeled racist, they will do it."
Exactly. Which is why we make so little progress in treating genetic disease that happens to afflict mental processes. "Oh no, you couldn't have inherited that; someone must have done something to make you that way."
We select for personality traits, intelligence, etc. in animals... that's all genetics. Is it so hard to consider that different environments would have selected for different mental traits in humans, too? And that a physical or mental advantage in that environment might be a disadvantage elsewhere?
Frank Spinath (best known as the lead singer in Edge of Dawn, but a professor of psychology in his day job) published a paper a few years ago on the heritability of personality traits in humans. He found the heritability was around .3, which is actually very high for a trait that is subject to environmental influence.
(And all the breeders of performance animals are saying, "We told you so...")