Well, I hate to ask this, but what does Reinhold Niebuhr have to do with this? Outside of his unorthodox Christianity which proclaimed the "Law of Love" which he based on the writings and thoughts of Kierkegaard, Heidegger, Buber, and Barth, further opening the doors to an interesting combination of social Christianity and Existentialism, he also believed in the importance of reacting to "evil." His other and far more well known writing came actually from a sermon he gave and is the God give me the power to blah, blah, blah thingie...........