In Kershaw’s book you mentioned, he too points out that at several points in Hitler’s life, events could have been changed somewhat simply.
After Hitler’s Beer Hall Putsch, if Hitler (on trial for high treason) had been sentenced to the fullest extent of the law, as well as held as an accomplice to the 20 deaths (4 police/16 Nazi) that resulted, and the millions(?) of Marks that were stolen from some government building seized by the Nazis, Hitler would not have been able to politically become Chancellor.
Later, there were struggles within the party. From 1925-1930, Hitler was able to edge out other possible leaders, for one reason or another, and effectively made it a party of (one) personality, his. Instead of being loyal to an “ldea”, he made “the Idea” synomonous with “The Leader”. Some of the other leaders of this period had radical ideas of economics (anti-private property/class struggle types, like Rohm, even though Rohm himself would probably never have been made The Leader) that would have forever kept the Nazis on the kook fringe as far as the voters were concerned.
Finally, in '32, had President Hindenburg granted the Chancellors (Bruning, Papen, Schleicher) the powers and “reforms” they requested, the same stuff he later granted Hitler, Hitler may not have ever achieved high office.
In a majority of cases, the opposition consistantly underestimated Hitlers (instinctive?) political skills and passion for what he believed in. (He toughed it out longer than most other folks. Most others eventually “compromised” to obtain power. He was much more stubborn.) They may have underestimated him because of his lower-class origins.
I get the impression from the book that Hitler’s main ability to sway people (with his public speeches) was through his sincerity and passion for the (somewhat vague) ideas and ideals he espoused. In private meetings, he stymyed some people with his stubborness and obstinacy, or he charmed them with his manners (looking them in the eye, overly long firm handshake, making the guest feel that Hitler cared about them personally or, at least, sincerely shared their concerns), depending on his mood and his read for what the situation called for.
Hitler’s speeches had always had the undertone of violence in them, both at the Jews, and at Marxists. (They were not mentioned in every speech, but when they were, it was not with affection.) The SA were street punks, roving gangs attacking folks; not all the time, but often enough that it should have been clear to anybody paying attention that the Nazis where NOT all about rainbows and ponies for everyone. Part of their allure was that they may have been seen as a way to “stability”, that post-WW1 Germany definately lacked.
I think the “moderates” of Germany at that time never truly believed that the Holocaust could happen, but it did. I can’t believe that it was Hitler’s idea alone, and one that only he alone could have made possible. There are too many other variables (people with influence with Hitler, or within the party or state system) for one man to be solely responsible for something that developed and profound. One woman or man may convince others that it’s nifty to put a yellow ribbon on your car to memorilize the war dead, but (according to wiki) 11 death camps? Rearranging railroad schedules?
To simply state that it’s all Hitler’s fault (especially since he’s safely dead and can’t implicate anyone else or even defend himself) that the Nazis came to power, that the war started, that the death camps happen is way too simplistic (Like saying man landed on the moon because JFK ordered it.), almost to the point of being useless. IMO.
I am no scholar, and all I state above has been gleened form the Kershaw book that I am still reading. If I misunderstood some parts, let me know.