When I was growing up, I heard lots of talk about Hitler. "How could anyone have listened to that madman rant and have believed what he said?" people would ask, shaking their heads sadly.
The implication was, good people like us — as we imagined ourselves to be — would have seen through Hitler from the outset and would not have been duped by the crazy talk about targeting minorities, ridding the nation of undesirables, letting blood flow in the streets to purify the country.