For many, the name of Adolf Eichmann is synonymous with the Nazi murder of six million Jews. As a perpetuator of the Final Solution he stands alongside Adolf Hitler and Heinrich Himmler as one of history's most notorious murderers, yet ever since Hannah Arendt's seminal book, "Eichmann in Jerusalem: A Report on the Banality of Evil," there has been disagreement about the essence of Eichmann and by extension, about the definition of evil action. Was he a human monster or a petty bureaucrat? To what degree did the totalitarian organization to which he belonged absolve him and his staff from...