Well I suspect the answer is we have never truly faced our history. What do you remember about this subject in Social Studies or other classes? I had one enlightened fourth grade teacher who embraced Jane Elliot's Brown Eyes/Blue Eyes experiment and texts about slavery but generally after that it was mostly crickets until college. When you don't face up to the mistakes of the past at one point or another there will be a reckoning. And there is so much to face.