Right and Left do not really mean the same thing in American politics as in European politics, it is a pointless bit of silliness to try to put the Nazis in either camp. In European terms they were a blend of the extremes of both ends of the spectrum...a Monarchist approach to government structure and power combined with a Socialist public welfare scheme.
I do not regard 'Historian' as a true profession, any more than I do 'Ethicist' or 'Journalist.' What do those terms mean? Nothing, really, but that one is immersed in reading other's writings and then cranking out their own usually-opinionated writings and engaging in stupid squabbles with rivals in their so-called professions. Studying it for four years or more does not teach you anything about it that you could not have learned without the tuition bill, unlike say archaeology, which does have scientific technique and serious protocols.
One of my most-disappointing experiences in the field of history was a Gettysburg staff ride with a renowned historian from the Army War College staff as a guide, he focused far too much on petty disputes over exactly where minor actions had occurred in the meeting engagement, and over which he was apparently engaged in disputes with others of his ilk (Whom, of course, he bad-mouthed). They were matters without meaning for the outcome of the battle or indeed any of the significant events that occurred during it.