I wish that would work, but history is remarkably pessimistic on that point.

If you want a great example check out "They Thought They Were Free" by Milton Mayer. He went into post-war Germany to interview people and figure out how they could have done what they did. The only ones who really acknowledged the horrors were the ones who knew better and only supported the Nazis out of cowardice. Most of the other interviewees thought of Hitler as merely a mediocre politician, who's real sin was starting a war he couldn't win. They basically shrugged off all the atrocities and deflected blame.