Do we really need 150 pro and opposing studies to understand?
For instance if a society import a minority white population, enslave and oppress them for hundreds of years and then conduct IQ tests to declare they are somehow deficient. How would the rest of the world look at that? Would they simply look at the IQ test results, or have deeper questions?
First people are enslaved and segregated for hundreds of years and just when the courts start enforcing hard fought equality laws in society, economic discrimination takes over via 'free markets' that as an 'outcome' limits access to housing, education, employment, financial services to people who have not had an opportunity to build wealth over generations like the rest. And then resurrect quasi eugenics and go out of the way to try to prove with IQ tests they are somehow deficient.
There is something extremely malicious and insidious about this obsession which fails to recognize others as fully functioning human beings and simply ignores the entirety of history, actions and consequences. And the only reason this can continue uninterrupted for hundreds of years is because in any other context the World would have intervened to stop this kind of sustained assault.
We do not understand fully how the brain works or the dimensions of human intelligence yet many are so confident to build truths and definitive conclusions on top of it.
Even if we for arguments sake accept IQ as some sort of indicator it is dishonest to diminish the impact of environment in the same indicator. As if a seed will thrive whatever the environment. This seems to be a transparently ideological position.
The idea that a rich or middle class upbringing with access to excellent education and resources will somehow produce the same outcomes as a poor family that cannot provide a stable home, proper nutrition, nurturing environment, educational resources and good schools is not logical and cannot be made in good faith.
Yet people with seemingly high IQs continuously make this claim. Suggesting perhaps that IQ is not everything. And maybe we should include tests for prejudice and bigotry in IQ tests that seem to reduce intelligence and promote a irrational mindset.