Perfectionism, no less than isolationism or imperialism or power politics, may obstruct the paths to international peace. Let us not forget that the retreat to isolationism a quarter of a century ago was started not by a direct attack against international cooperation but against the alleged imperfections of the peace.
Politics is still crucially important. Our choices are vital, and we've got to make them, and not just say, 'Oh, they're all the same.' They are all the same in certain ways, alas -- a political animal is such an animal. But lurking somewhere behind their rhetoric and their spittle are important choices that we should make.