The new finding tried to answer how, exactly, the two became connected. Hodson's conclusion:
The factor that explained the relationship between these two variables was political: When researchers included social conservatism in the analysis, those ideologies accounted for much of the link between brains and bias.
The researchers speculate that conservative ideologies offer a more black-and-white worldview, which would be more appealing to people who finding it hard to take the position of the Other.
These findings correspond with Hetherington and Weiler's studies of authoritarianism and polarization which I blogged about before. Hodson's psychological study does not really look at the political mechanism by which low-IQ people find out about socially conservative ideologies. Political scientists Hetherington and Weiler, on the other hand, point to the fact that conservative organizations and parties have, over the past generation, actively sought out fearful people.
It seems a reasonable step to me to suppose that low-IQ people are more fearful than others. That would be an excellent subject for the next study.