"Enlightenment thought was marked by two great attempts to ground ethics in something other than tradition. One belonged to the Scottish enlightenment - David Hume and Adam Smith - who sought it in emotion: the natural sympathy of human beings for one another.[8] The other was constructed by Immanuel Kant on the basis of reason. It was illogical to prescribe one ethical rule for some people and another for others. Reason is universal, argued Kant; therefore an ethic of reason would provide for universal respect ("Treat each person as an end in himself").[9] Neither succeeded. In the twentieth century, villages and townships where Jews had lived for almost a thousand years witnessed their mass murder or deportation to the extermination camps with little or no protest. Neither Kantian reason nor Humean emotion were strong enough to inoculate Europe against genocide."