What Sort of Realist Was Reinhold Niebuhr?

The great mid-20th-century Christian theologian Reinhold Niebuhr developed a political theory, dubbed “Christian realism,” that sought to synthesize the demands of Christian ethics with the demands of conducting foreign policy in a dangerous world. Decrying the utopian thinking that led some devout Christians to pacifism, Niebuhr supported American efforts in World War II and the cold war. Taking on the master’s mantle, some of today’s foreign-policy realists appeal to his critique of the notion that democracy can be spread easily across the globe, which they use as an argument against democracy promotion itself; according to Paul D. Miller, they lack a proper understanding of Niebuhr’s ideas: