If we don't teach them about it that becomes the equivalent of censorship. People argue against this because they are afraid of the past and think that by bringing it up it will repeat itself when reason the opposite is true. Just because an area of our history is shameful doesn't mean that it should not be shown. "The fact is that censorship always defeats its own purpose, for it creates, in the end, the kind of society that is incapable of exercising real discretion."
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