>But when other people are totally happy to talk about speed and blood pressure and comas and the crime rate, and then suddenly switch to a position that we can’t talk about IQ at all unless we have a perfect factor-analytical proof of its obeying certain statistical rules, then I worry they’re just out to steal cows.... But when people never even begin to question the idea of different cultures but make exacting demands of anyone before they can talk about different races – even though the two ideas are statistically isomorphic – then I think they’re just out to steal cows.
There is of course, the opposite problem, which is that people take things like IQ and infer wild conclusions, usually in the service of white supremacy. An example of this is the MAO "Warrior Gene." There are several studies showing a weak correlation between a variant of the gene and violence. Black Americans have this gene more often.
There is a specific, very bad, study that is often quoted. It cherry picks its data, and still can't achieve a significance of p > .05.[1] Yet it is often brought up as indisputable proof of the savage nature of black people. It's ridiculous, and IMHO, much worse than the tendencies criticized in the blog post.