Dana Goldstein has a very nice takedown of Jason Richwine, formerly of the Heritage Foundation, who misused of IQ to argue that Latino immigrants should face restrictions as they are low IQ, including this:
Richwine recognizes Brigham’s bias toward certain white people. Yet he assumes that innate genetic traits are responsible for Latino’s lower IQ scores over the past several decades, as opposed to the many socioeconomic realities described above and acknowledged as far-greater predictors of IQ. Richwine writes that since Asians are both poor and do well on IQ tests, this destroys the argument that poverty accounts for Latino’s lower scores. Yet poverty is not a monolithic phenomenon. It differs culturally, across the globe, in terms of how much emphasis is put on academic learning. Ex; Until Reconstruction, it was illegal in the American south to teach black people to read. Chinese culture has emphasized success on written civil service examinations for over a millenium. Some Latino teenagers arrive in American public schools nearly illiterate in Spanish; they come from agricultural communities in countries where anything beyond an elementary education is off-limits to the very poor. Comparing Asians to Latinos is thus exactly the sort of “out-group” analysis that Heckman and Binet warned about.