I have heard that the younger generations are the opposite actually - b/c of having access to the internet and reading, they are being exposed at a younger age than ever before to things such as the fact that USA killed off the native Americans (genocidally murdering/raping/thieving/etc.), and also owned human beings. The parents ofc are freaking out, and trying to stop this "knowledge", or at least they say that they want to slow, and not expose little Timmy to things that he doesn't need to know about until he is older.
The odd part is that children are extremely resilient - they can accept death as natural, and the fact that this nation in its past has made some questionable (okay so fine: downright EVIL) choices - but it is the PARENTS that are the ones who cannot accept that.
The Baby Boomer generation in particular, I've noticed, seems to prefer this "let's pretend" attitude, perhaps as a result of growing up emotionally scarred from all the wars (WWII, Korea, Vietnam), they just want to pretend that everything is fine, even as the world burns (in some cases, literally) around them.