Because we have forgotten the pain of our grandparents and great grandparents, if we ever knew it. Because we're taught hollow, neutered versions of the chronology in history class, without ever examining the social dynamics, the psychological mechanisms of propaganda and the causes for this ideological cancer. Because a good chunk of our people are in misery in some way and have never been given the tools to actually figure out why, so when the next round of grifters came by and gave them an enemy to blame, a golden past to glorify and an easily digestible reason for why their lives are bad, they fell for it just like our ancestors did.

Maybe other parts have it better, but looking back at my own schooling, we didn't learn from history because we never learned the whole history.