As a scientific theory, evolution by natural selection is a historic success. Its use in human affairs has a murkier history. In Darwin’s time, evolutionary theory was distorted by philosophers such as Herbert Spencer, famous for coining the phrase “survival of the fittest.”
Spencer was not primarily interested in evolution as a biological theory grounded in natural history. Rather, he saw in Darwinism a novel method of promoting his political ideas with the authority of scientific language. Appropriately, his slogan “survival of the fittest” became a justification for views ranging from laissezfaire capitalism to eugenics and pseudoscientific racism. In Spencer’s Social Darwinism, such measures were allowed to hurt the weak, for “the whole effort of nature is to get rid of such, to clear the world of them, to make room for better.”1 From the comfort of his armchair, Spencer turned Darwinism from a science of the curious into a philosophy of the powerful.