That Isaiah Berlin quote reminded me of this observation from Leo Straus, which I think I posted in here a month or so ago. It seems appropriate given the discussion and the headlines:
Finite, relative problems can be solved; infinite, absolute problems cannot be solved. In other words, human beings will never create a society which is free from contradictions. From every point of view it looks as if the Jewish people were the chosen people, at least in the sense that the Jewish problem is the most manifest symbol of the human problem insofar as it is a social or political problem.