Seriously though, I think that completely for different reasons.
It is tragic that we do not teach how different humans over diverse conditions have expressed their relationships with existence.
We readily include how humans have perceived, how humans have governed, how humans have invented, fought, built, bought, eaten, practiced medicine, provisioned, died, torchured, saved and how humans have dressed.
However, how humans expressed their relationship to existence is somehow taboo.
Yes. We can surely learn of great horrors and see images of Nazi crimes in history class, but dare mention how the Egyptian religions expressed the way the culture understood their relation to existence and we are invading some region not permitted.
I think that is sad.