Writing on theology and ethics and their application to politics and economics in An Interpretation of Christian Ethics, Reinhold Niebuhr runs the risk of fusing the respective domains, which I maintain are qualitatively different, and thereby minimizing or losing outright what is unique to each domain. Besides occasioning category mistakes, such as in labeling divine love as ethical rather than as distinctly theological, overreaches from one domain onto another even at the expense of the other’s own criteria can occur from the underlying error. Besides being extant in Niebuhr’s text, the conflation of distinct domains and the related overreaches of their respective criteria has exacerbated the long-standing conflict between the Jews and Arabs in what was Palestine when Niebuhr was writing his book on Christian ethics in which he discusses the sheer intractability of the conflict.
The full essay is at "Jews and Arabs in 1930s Palestine."