Human Nature and World Politics: Rethinking `Man'

While realists acknowledge that their theories of world politics are rooted in specific assumptions about human nature, neorealists tend to discount human nature in favor of an emphasis on systemic forces. Nevertheless neorealism has assumptions about human nature that shape neorealist theorizing. Specifically, in Man, the State, and War and Theory of International Politics, Waltz make essentially the same assumptions about human nature as the realists — that our human natures are fixed, that we cannot trust others, and that decision-makers are rational calculators who seek to promote their narrowly defined self-interests. Moreover, for Waltz, human nature determines world politics as much or more than its anarchic structure. A review of biology, specifically human neuroscience, suggests that these assumptions about human nature, and its relation to world politics, ought to be challenged. Our `natures' are much more complex and flexible than realism and neorealism assumes.