I found a very interesting source - probably the best out there:
"Analysis of the Personality of Adolph ******...", written 1943 by a well-known psychologist. You can download it at http://www.lawschool.cornell.edu/lib...onovan/******/
I recommend reading at least Segment 2, which contains a summary of the entire report."The proper interpretation of ******'s personality is important as a step in understanding the psychology of the typical Nazi, and - since the typical Nazi exhibits a strain that has, for a long time, been prevalent among Germans - as a step in understanding the psychology of the German people. ******'s unprecented appeal, the elevation of this man to the status of a demi-god, can be explained only on the hypothesis that he and his ideology have almost exactly met the needs, longings, and sentiments of the majority of Germans."
(15 minutes later)
Wow, Segment 3 is great, too. Enough said. Everything I could possibly have said about ****** is in there. What a great psychologist. He resolves the contradictions so effectively -- how ****** is both a neurotic and yet a "highly effective person."