It is certainly more nuanced and complex than reducing it in terms of a persons's propensity towards good and evil. You must look into the psychosocial conditions that made Germany the breeding grounds for Nazism. Why was it appealing to the ordinary Germany citizen? I recommend reading Erich Fromm's book Escape from Freedom as he explores this at depth. Still a relevant book almost 80 years after being written — where might observe similar phenomena today?
where? Not a question hard to answer these days. Somehow, like the story descibes happened almost 100 years ago, this gradual mindshift seems to have happened over the past decades without people noticing it.
