In the wake of the Trayvon Martin shooting, several journalists have written about "the talk" - the talk black parents have with their kids about how to deal with racism, racist cops, profiling, etc. That problem is real, and the advice given is probably 99% correct. It ain't a perfect world.
John Derbyshire responded with the talk that non-black people have with their kids, and with foreigners visiting here, and such like. We all know what that talk is - what part of town is best to avoid, especially at night, what nightclubs and other places you might wish to pass on, etc.
John's taken it a little further - he has referenced some well-established if not terribly pleasant truths about the statistical distrubution of IQ as it is defined by certain standardized tests. But overall, most white people would have to agree, perhaps reluctantly, with his advice to his children, if not necessarily his rationale for why it is so. I'm not sure I agree with all of his rationale, either, but there is at least some truth in it.
But we are not allowed to admit, much less say such things. This is in part because in the past, various government policies that were based on the science of the day turned out not to be such good policies. In other words, eugenics hasn't worked well as a government policy. Nor should it have a role; we are all God's children, regardless of variations in our ability to score well on a test that measure, mostly, one's ability to handle certain types of abstract and symbolic thought.
The government's record of using the science of genetics to improve the human condition should serve as a cautionary tale when we consider having the government use other sciences to attempt to improve the human condition. I would not go so far as to say the government should _never_ do such a thing, but we do need to remember they get it wrong rather freqeuntly, particularly when the science is not well understood.
So, what can we conclude?
1. Have "the talk" with your kids - in whatever form works best for you.
2. Never admit you did. ;-)