Obama doesn’t tell you what he’s thinking. He keeps his motives to himself. Cherished long-term ideological goals are advanced as pragmatic fixes to concrete problems in the present. Now we’re seeing the familiar domestic pattern in foreign policy as well. Few Americans realize that Obama has had a longstanding interest in multilateral efforts to combat war crimes and genocide. Obama would like to see a more constraining international legal regime on war crimes, even at the cost of national sovereignty, not to mention the blood and treasure of the countries doing the enforcing. In general, Obama has said little about...