Derb on Obama and human sciences

It's amazing the manner in which atheist/skeptic types routinely fail to appreciate the logic of their own positions. Case in point: John Derbyshire, the village atheist at National Review, and his article on Obama and the human sciences.

According to Derb, the old nature/nurture argument has been settled by science, and nature is the winner.

Most people still think of human-science controversies in terms of nature/nurture. As a matter of real scientific dispute, that is all long gone. Nature/nurture arguments were at the heart of the sociobiology wars that roiled the human sciences through the last third of the 20th century. (The 2000 book Defenders of Truth, by the Finnish sociologist of science Ullica Segerstråle gives a full — and so far as I can judge, very fair — account.) The dust of battle has pretty much settled now, in science departments if not in the popular press, and nature is the clear victor. Name any universal characteristic of human nature, including cognitive and personality characteristics. Of all the observed variation in that characteristic, about half is caused by genetic differences.

That's bad for left-wingers, says Derb, because central to their politics is the notion that inequality is entirely due to environmental and social factors. But if the human sciences show that the most signficant factor in determining the course of an individual's life is his genes, then the rug is pulled out from under all those grand liberal plans to produce universal equality through government intervention.

Derb thinks that if Obama is elected, he may make moves to squelch research in the human sciences, since those sciences are producing results unfavorable to his politics. Why does Obama favor such leftwing politics? Given the arguments he just made, we would expect Derb to answer this question in terms of genetics. After all, genetics allegedly explains at least half of personal differences. But Derb attributes nothing of Obama's politics to genetics; the causal origin of Obama's politics, Derb says, is entirely a matter of nurture:

Barack Obama was raised in an atmosphere of “cultural Marxism.” His mind was set that way, and he retained the essential precepts of the creed into adult life, as his close association with somewhat-more-than-cultural Marxist Bill Ayers illustrates (as of course do Obama’s remarks quoted above).

Those all-powerful genes are apparently utterly helpless in the face of an "atmosphere" of cultural Marxism. Derb's argument is typical of determinists. They start by claiming human life is determined by some non-rational cause (genes, the clockwork Newtonian universe, the Fates, the stars - it doesn't really matter), and make their argument entirely in the abstract. Then when they come to some specific matter of actual importance, the causal framework they just constructed is completely abandoned and they explain things in terms of the rational causes they just denied.