>>9450>the heritability of IQ is pretty high
No. And yes. Somewhat. Not really. In part.
It's actually a rather complex situation in which it can be found to be even less than 50% (typically for certain groups of children) and even more than 75% (typically for certain groups of adults). There's no ironclad scientific consensus on the subject. It can be said, though, that beyond the complexity there's a certain kind of balance found in how genetics can be reinforced by environments that then encourage individuals to reinforce expressed traits. Thus, SES/socio-economic-status can be crucial.
"Results demonstrate that the proportions of IQ variance attributable to genes and environment vary nonlinearly with SES. The models suggest that in impoverished families, 60% of the variance in IQ is accounted for by the shared environment, and the contribution of genes is close to zero; in affluent families, the result is almost exactly the reverse."> https://journals.sagepub.com/doi/10.1046/j.0956-7976.2003.psci_1475.x
It's also worth mentioning that "intelligence" as a general cluster of somewhat only slightly related attributes and the specific trait of "IQ testing success" are quite different in application often.
"General cognitive ability yielded a heritability estimate of about .80 in two assessments 3 years apart as part of the Swedish Adoption/Twin Study of Aging. This is one of the highest heritabilities reported for a behavioral trait. Across the two ages, average heritabilities are about .60 for verbal tests, .50 for spatial and speed-of-processing tests, and .40 for memory tests."> https://link.springer.com/article/10.1007/BF01067188
Personally, I think that what's happening under the cloak of scientific-sounding racism, sexism, and the rest is something like coming upon a gigantic painting that's made of multiple shades of grey in a deliberately blended, sloppy fashion only for belligerent observers to scream "It's all black! Black as midnight!".
If the hardcore right-wing types who obsess about IQ scores actually cared about the general notion of "intelligence" then they'd advocate for something like, say, promoting breastfeeding among U.S. mothers. As mentioned before. Or for mass campaigns to destroy lead materials safely in order to stop the widespread lead poisoning that happens here.
Instead, they don't give a damn about that. It's all just an empty form of rhetoric. Criticism for those who supposedly have lower IQs and are thus of less worth compared to the self-puffery of the right-wingers.