I haven't looked at the evidence with enough care to have a strong opinion. I certainly don't think the "race realist" position is impossible in principle. (Some versions of it, anyway. I'm sure there are stupid versions that are obviously wrong, but there are stupid versions of everything that are obviously wrong.) On the other hand, I'm not impressed by the quality of some of the research I've seen cited to support it, and the startling rapidity of the Flynn effect seems to me to give good reason to think that performance on IQ tests is more affected by cultural and/or environmental factors than everyone would like them to be. On the other other hand, while the relevant evidence is pretty shitty there does seem to be quite a lot of shitty evidence pointing the same way. On the other other other hand, most of the people making noise about the aforesaid evidence show signs of really genuinely being horrible racists, which is maybe what I'd expect if the evidence were crap and people only believed it because it suits their prejudices. On the other^4 hand, that's also roughly what I'd expect if the evidence were perfectly OK but it were socially unacceptable to say such things, as in fact it is.

So, all things considered, I'm buggered if I know, and getting to the bottom of it seems like it would involve wading into a swamp of horrible racism on one side and kneejerk social justice on the other, filled with research that's crappy because (1) doing decent research on this stuff is really difficult and (2) for very understandable reasons hardly anyone actually wants to work on it. Which sounds like a lot of No Fun.

So I'm reserving judgement and leaving that particular cesspool well alone; it occasionally makes itself slightly useful by encouraging people whose brains have been fried by one sort of politics or another to reveal themselves as such by shouting obnoxiously about it.

(My political prejudices incline me to the "it's all bloody nonsense" side. My prejudice in favour of things with sciency-looking studies backing them up inclines me the other way. I try not to be pushed around too much by my prejudices.)