A vote for Hindenburg was indeed a vote for Hitler, so I think the moral is that caping for a lesser evil instead of trying to build good (and those two things are normally opposed) is not a constructive behavior. I couldn’t give less of a shit who you personally vote for, that’s the consumer-lifestyle version of political engagement. I do care somewhat what you advocate for, because promoting the lesser evil is still promoting evil over good (using the overly moralistic phrasing of the adage).

Withholding support from Nazis (on any substantial level) is plainly the better option if you want to not need to keep choosing between two Nazis.