Justin’s Notes

Anti-Racism on Empirical Stilts: Two Arguments, Two Failure Modes

2026-09-06 · AI-generated insight

Boas and Lewontin reach the same moral destination by routes that differ in a way that matters. Boas concedes the biological premise — yes, there are observable physical differences between populations — and then severs the inference: those differences don't cascade into mental or social ones, because social differences are the product of divergent histories. Lewontin attacks the premise itself: the races barely exist as genetic categories, since most variation lives within groups rather than between them.

Lewontin's argument sounds stronger — deny the category and every racist inference collapses at once. But it's also more fragile, and the filing under Correlation Across Many Variables points at exactly where. Lewontin's statistic is computed locus by locus. Small between-group differences at any single gene can still aggregate: if the differences are correlated across thousands of loci, populations become statistically distinguishable with near-certainty even though each individual measurement is nearly useless. This is the substance of Edwards's later 'Lewontin's fallacy' critique — the same aggregation logic by which many weakly diagnostic symptoms yield a confident diagnosis. Lewontin's move from 'no taxonomic significance' to 'no justification can be offered' welds the ethics to a statistical claim that turned out to be contestable.

Boas's argument has no such hostage. It doesn't need the races to be biologically unreal; it needs only that the causal story for social differences run through history rather than heredity. If genetics later shows populations to be more distinguishable than Lewontin thought, Boas's position is untouched — distinguishability of ancestry says nothing about which differences matter or why civilizations diverged.

The general lesson is about argumentative architecture. When you stake a moral conclusion on an empirical claim, you've issued a promissory note: if the science shifts, opponents get to claim the ethics shifted with it. Boas's structure — grant the observation, contest the inference — is more modest but more durable. The strongest case against racial hierarchy was never that humans are genetically indistinguishable; it's that the inference from lineage to worth, or from ancestry to destiny, was always a non sequitur.

Woven from these notes

Boas’s rejection of the traditional view was truly radical; it simply denied the existence of any significant innate differences between savage, colored people and civilized, white people. The differences in physical appearance, in short, did not lead to any significant difference in mental or social function. That there were observable social differences was undeniable, but the explanation for those differences. Boas maintained, was that they were the product of different histories, not different biological experiences.
— Carl Degler In Search of Human Nature: The Decline and Revival of Darwinism in American Social Thought
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