As long as we continue to study and cite Hobbes, Rousseau, and Marx—none of whose views of human nature can today be ranked as scientific—it would be perversely backward-looking to refuse even to consider sociobiology and what follows from it.

Peter Singer, Ethics and sociobiology, Philosophy & public affairs, vol. 11, no. 1, 1982, pp. 40–64, pp. 40-64