I'll put my 2c in as well.
I don't know (of course) whether there is any truly genetic component to measured differences in mean IQ between racial groups in the US. I think that to answer that question we'd need to define very carefully what we meant by the terms involved, including "genetic", actually: it's not quite as clear as these discussions often make it sound. Some article I read recently pointed out something I'd expand as follows: that generally in biology, if you take two groups from a species which differ in some observable feature (eye colour, leaf shape, skin colour, whatever) and then you look at some attribute that varies measurably within each group (height, number of seeds produced, IQ, whatever), and you measure the mean of that attribute across each group, you would generally expect that the means of the two groups would ("happen to") be different for these two groups. The groups having identical means would be the thing that required explanation, not the converse. Will there be a "genetic component" of the attribute, then? For most definitions, probably yes, but that doesn't make this fact or the original choice of groups interesting.
This is what mostly strikes me: the "so what" of it. It reminds me strongly of the debate about mathematical ability in males vs females, which is something I am more competent to talk about. Observably, most extremely talented mathematicians are male. Debate has raged about whether men are "genetically" better on average than women at maths or more likely to be in the tails or whatever. Once you start looking into it, it's clear that there's no convincing way we could ever be sure. Girls and boys are socialised differently from the moment of birth (literally: there's a very interesting study of what people say to boys and girls as babies in the delivery room!) so there's no practical way you could ever separate out the effects of social expectations of boys vs girls from the effects of genes. But if you could, what would you do with that information? The variation in mathematical ability among people of the same sex completely swamps any between-sex difference, so knowing whether someone is a boy or a girl is not useful in predicting how mathematical they'll be. Nobody would defend, for example, making certain kinds of mathematical education available to only one sex or the other. At the end of the day the presence or absence of a sex-linked genetic influence on mathematical ability is just not a very interesting question.
And similarly, well, what I'm saying is obvious, I think. There are better things to spend time on, like how to educate children, and this isn't because race and IQ is a touchy subject, it's just because it's not a very interesting subject!
