It seems like, for some people, equality is always just too much to ask. Every single time any marginalized group has wanted equal rights, they've always had to fight for them. People can say that this is Racial Conflict Theory in action, but it doesn't make it less tiring or sad.

Here in the US it is especially egregious because of our long history of genocide and slavery and various rights violations. People will refuse to admit such happened or, worse, they'll say any history written is simply Left bias or rewriting of history.

White people seem to like viewing ourselves as distinct, as above all others, as the light of Civilization in a dark, barbaric world. To maintain this useful bit of propaganda, our history books and classes are all tailored around this lie. Other cultures, other countries, other civilizations--if they're talked about at all--are summarily dismissed. If anyone asks why, they'll get an answer of "there's not enough time to cover all history", but if a school wants to teach more on them, conservatives will block it with vengeance.

So, really, there's a desire to keep the truth of the bravery and accomplishments of non-cis/het folks hidden. It could be taught but will not be because it disrupts the narrative of White Superiority.