Social Darwinism

Social Darwinism is the family of ideological doctrines that applied the logic of natural selection to human social, economic, and political competition, claiming that selection pressure in human societies favored superior individuals, races, or nations. The term is most closely associated with Herbert Spencer (who coined survival of the fittest in 1864, which Darwin later adopted) and the scientific racism and laissez-faire capitalism that flourished under its influence from the 1870s through the 1930s.

The foundational error of Social Darwinism is importing a context-dependent biological concept into a normative political framework. Fitness in evolutionary biology means reproductively successful in a specific environment — it has no context-independent meaning and confers no moral status. A bacterium fit for a pre-antibiotic hospital becomes unfit once penicillin is introduced. Social Darwinism required that some humans were objectively more fit — a claim the actual theory of natural selection cannot support and explicitly contradicts.

The doctrine reached its most catastrophic expression in eugenics — the program of improving human populations by selective breeding — which was embraced by progressive reformers and scientific establishments in Britain, the United States, and Germany before being discredited primarily by its association with Nazi racial policy. That the same idea was respectable science in 1910 and was morally catastrophic by 1945 is one of the clearest cases in modern intellectual history of how cultural reception shapes scientific legitimacy.

Social Darwinism is frequently described as a misapplication of Darwin — an abuse of an otherwise sound theory. This is too comfortable. Darwin's own writing on human races in The Descent of Man (1871) contains passages that Social Darwinists read, reasonably, as support for their position. The relationship between Darwin's science and Social Darwinism is entangled enough that blaming only the ideologues is a form of historical hygiene.