I don't know how far you take it in schools, because they are kids afterall and throwing the horrors of slavery on a 9 year old is probably a bit much, but slavery, jim crow, even lynching has been so sanitized, it doesn't seem "that bad." Work a little in a field, get whipped if your bad, get housing and fed.
People can't even relate to back breaking field work in the southern heat, let alone the rest.
My (white) dad recently went to one of the err civil rights or slavery museums in alabama... he came back and said, "I didn't realize lynching was like THAT." aka a spectacle for white people to watch a black guy tortured while they ate food and took pictures for god sake. It wasn't, "white man shoots black guy who did something wrong." It was a whole society that was broken.
The "bad" ones took the information and gave us Trumpism. The "good ones" allowed Trumpism to spread due to indifference because it didn't effect them (until it did). And thats how you get a supremely fucked Supreme Court where the one black guy is the worst of them all.