I had an interesting argument with Charles Murray at yesterday's Cato Book Forum. While he expressed fundamental agreement with my views on nature and nurture, he thought parental marital status was an important exception. Children of divorce do worse than children whose parents remain married; children of never-married parents do worse than children of divorce. At least at first, Murray seemed to see these disparities as entirely causal: getting married causes your kids to do better in life; getting divorce causes some (but not all) of that benefit to go away.
I objected that divorce and single parenthood are not random. People who divorce are on average more impulsive and quarrelsome. Single parents are on average more impulsive and less achievement-oriented. Since these traits are heritable, we'd expect children of divorce and children of single parents to have worse outcomes - even if they were adopted at birth by Ozzie and Harriet.
By the way, if you like either of today's two posts, or are anticipating my upcoming VDARE column on an overlooked reason why Republicans are almost as hostile as Democrats toward noticing the race-IQ nexus, please consider donating using the Paypal button at the top of the the righthand column above.