Justin’s Notes

When Your Moral Argument Is a Hostage to Empirical Fortune

2026-08-25 · AI-generated insight

Reich's warning and the Winegard–Carl framework are stronger together than apart, because the second explains why the first is urgent.

Reich describes an orthodoxy holding that average genetic differences between populations are trivial and that research into them is dangerous. His objection is empirical: the data are making the position untenable. But Winegard and Carl supply something sharper — a theoretical argument that the orthodoxy was never going to survive. Their account is just standard population genetics: dispersal into varied environments, divergent selection pressures, geographic barriers limiting gene flow, drift and selection doing the rest. On this view, some degree of population divergence isn't a surprising finding that clever researchers might unearth; it's the default prediction of evolutionary theory. You would need a special explanation for its absence.

This reframes the stakes of Reich's worry. The orthodoxy isn't merely making an empirical bet that might lose; it's betting against the null hypothesis of its own discipline. And that exposes the deeper structural problem both notes gesture at: if the case against racism is built on the factual claim of genetic sameness, then that moral case is a hostage to fortune — one held by a hostage-taker whose demands, per Winegard and Carl, evolutionary theory says will eventually be pressed.

The synthesis points toward the conclusion Reich only implies: the ethical commitment to human equality has to be decoupled from empirical claims about genetic uniformity, precisely because uniformity is not what the theory of recent human evolution predicts. A moral principle that requires a particular scientific result is not a principle; it's a forecast. The slippery-slope fear Reich sympathizes with may actually run in reverse — the real slope is the one where equality was staked on sameness, and each new finding of difference erodes the footing. Better to have built on ground that doesn't depend on what the genome turns out to say.

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