Justin’s Notes

The Vacuum Defense: How Guarding a Taboo Cedes the Territory

2026-08-16 · AI-generated insight

Lewontin's famous finding — that most genetic variation lies within rather than between populations — is empirically sound, but watch what he does with it. In a single paragraph he slides from a statistical observation to a sweeping normative decree: racial classification is "of no social value and is positively destructive," so "no justification can be offered for its continuance." The science ends and the verdict begins, with no argument bridging them. Winegard and Carl quietly expose the gap: populations separated by oceans, deserts, and divergent selection pressures will diverge, and Lewontin's within-group statistic doesn't refute this — single loci overlap heavily even when correlated differences across many loci reliably distinguish populations (the tag "Correlation Across Many Variables" names exactly the structure Lewontin's method ignores).

The Coon anecdote shows the same move in institutional form. The AAA condemned Putnam's book after a show of hands revealed that almost nobody in the room had read it. The condemnation may even have been directionally correct — but its procedure was theological, not scientific. Verdict first, examination optional. Lewontin's leap and the AAA's vote are the same gesture at different scales: using scientific authority to close a question rather than answer it.

Reich supplies the punchline about why this strategy fails on its own terms. He shares the orthodoxy's fear of misuse — the slave trade, eugenics, the Nazis are real precedents — but argues that it is "simply no longer possible to ignore" population differences. The data are coming regardless. If the credentialed refuse to discuss them honestly, the discussion doesn't stop; it migrates to people with fewer scruples and worse methods. The Coon episode already demonstrated the cost: each condemnation-without-examination spends down the public trust that makes scientific authority worth having. The orthodoxy's defense against pseudoscience — denial by fiat — thus manufactures the very vacuum pseudoscience fills. The safeguard isn't the taboo; it's the credibility the taboo destroys.

Woven from these notes

The orthodoxy maintains that the average genetic differences among people grouped according to today’s racial terms are so trivial when it comes to any meaningful biological traits that those differences can be ignored. The orthodoxy goes further, holding that we should be anxious about any research into genetic differences among populations. The concern is that such research, no matter how well-intentioned, is located on a slippery slope that leads to the kinds of pseudoscientific arguments about biological difference that were used in the past to try to justify the slave trade, the eugenics movement and the Nazis’ murder of six million Jews. I have deep sympathy for the concern that genetic discoveries could be misused to justify racism. But as a geneticist I also know that it is simply no longer possible to ignore average genetic differences among “races.”
— David Reich How Genetics Is Changing Our Understanding of 'Race'

A more plausible conception of race, one that is consistent with how careful philosophers and geneticists use the term, recognises that: When humans began leaving Africa around 75,000 years ago, they dispersed across a much greater range of environments than they had previously inhabited. The humans that settled in different geographic regions subsequently came under different selection pressures (e.g. temperature, seasonality, altitude). Natural barriers such as oceans (e.g. the Atlantic), deserts (e.g. the Sahara) and mountain ranges (e.g. the Himalayas) impeded gene flow between different populations for substantial periods of time. When there is limited gene flow between populations that have come under different selection pressures, we would expect them to gradually diverge from one another over via the processes of genetic drift and natural selection.

— Bo Winegard, Noah Carl Superior: The Return of Race Science—A Review
Carleton Coon was one of the greatest anthropologists of the 20th century and a champion of the study of racial differences. In 1961 he was elected president of the American Anthropological Association. It was during this year that Carleton Putnam's infamous book Race and Reason came out. Putnam's book argued that there were significant differences between the races and that this had important political implications. A few anthropologists became upset when they saw the book gain popularity and wanted the AAA to intervene. But they knew that Coon supported the book and that, as a result, having the AAA take action against it would be difficult. So they organized a secret meeting behind Coon's back in order to issue a statement denouncing Putnam's work. Coon found out about the meeting and went to stop it. Upon entering the meeting Coon asked all the association members who had actually read Putnam's book to raise their hands. Only one rose. He then asked for the hands of everyone that had even heard of the book prior to that meeting. Only a few hands rose. None the less, the statement against the book passed. Coon, disgusted by the actions of his peers, resigned from the AAA (1). This incident stands out in the history of science as a particularly clear example of scientists not living up to what people expect of them. People often take what scientists say for granted. They trust that scientists have looked at the evidence rationally and are giving the public as accurate an account of all the relevant facts as they can. When explaining science to laypeople researchers are expected to only make authoritative statements on topics they are knowledgeable of, to not lie about scientific evidence, and to not omit obviously relevant facts. People trust scientists to do these things and so feel comfortable taking what they tell them for granted. (See
It is clear that our perception of relatively large differences between human races and subgroups, as compared to the variation within these groups, is indeed a biased perception and that, based on randomly chosen genetic differences, human races and populations are remarkably similar to each other, with the largest part by far of human variation being accounted for by the differences between individuals. Human racial classification is of no social value and is positively destructive of social and human relations. Since such racial classification is now seen to be of virtually no genetic or taxonomic significance either, no justification can be offered for its continuance.
— Lewontin