The questions surrounding the origins of Hitler's anti-semitism are also explored in detail.
There are scholars quoted who adamantly believe that any attempt to understand is misguided because understanding Hitler's motivations is considered by them to be the first step toward rationalization and diminishing the horror of the Holocaust to just a human crime on a larger scale.
This is not a biography of Hitler although many critical episodes in his life are referenced. Instead this is a fascinating look at how different perspectives on the nature of Hitler's evil have developed and how in the end there is no comprehensive answer as to the how and why of the suffering he unleashed. THere is a quote used from Primo Levi's book Survival in Auschwitz. Levi suffering from thirst reaches for an icycle. An SS guard knocks it away and Levi asks "why ?' The response.."there is no why here". I think that story captures some of the spirit of Rosenbaum's book.