> concerning g is that it's largely genetic, and immune to "intervention" AKA stability

Biology seems to be the destination for smuggled in quasi-religious beliefs. Lysenkoism, creationism and in the case of a segment (or more?) of the western professional-managerial class, this kind of Bell Curveism.

In the past people were satisfied with the divine apotheosis of people into a superior Brahmin class, or chosen people, or even in more modern times a Calvinistic elect, which this is an attempt to smuggle in as a secular, "scuentific" basis.

If we were watching elementary particles smash together in an accelerator, the idea that a brain could be boiled down to a number and ranked in order, and said this be due to differential genes and such would be seen as absurd. Especially considering human behavioral modernity happen two to three thousand generations ago, if one knows a genetic time scale. For our version of biological Lysenkoism or creationism, this all goes out the window though. Speaking of Lysenkoism, it is akin to the Marxist idea of false consciousness - the people who believe such ideas can see the errors of Lysenkoism or creationism, but the crank idea tied to their particular system makes a lot of sense to them.

I think of al-Andalus in Spain the 1450s, or the Battle of Vienna in 1683. Until a few centuries ago, Europe could barely keep itself free of Arab or Turk rule (and often didn't). Change back a few centuries and this would be about the genetic superiority of the Arab brain over the Caucasian. It's all quite silly.