Understanding human prehistory is extremely important, and it should be taught in schools. I genuinely think a lot of persistent and irritating issues would be somewhat mitigated if prehistory was more commonly understood.
The issue of race really gets put into perspective when you understand what a genetic bottleneck modern humans are. That we are not only all one species but all one subspecies. That we all ultimately descend from dark-skinned Africans, with light skin evolving relatively late. Similarly, the idea that any one ethnicity is more or less intelligent falls apart when you learn that full human intelligence evolved before modern humans.
Evolution would also become less touchy if more people actually understood that we are the last in a long line of human species rather than directly descended from apes.
There would be less trendy diet bullshit if we all had a basic understanding of how our prehistoric ancestors ate. No "humans are herbivores" if you know that even the earliest humans were eating meat. No raw meat bullshit if you know that humans have been cooking since Homo erectus and that we as a species evolved to eat cooked meat. There's even a theory that more easily digestible cooked meat freed up energy that allowed our brains to get as big as they are!
You're less likely to waste your time looking for shit like Atlantis, Mu, or Lemuria if you know about actual sunken landmasses like Doggerland, Sahul, and Sundaland.
Also, the unga bunga caveman stereotype is bullshit and ultimately rooted in racism. Prehistoric people did not live in caves, and they didn't only wear crude furs. They lived in houses like anyone else, and some wore very elaborate clothing, as in this reconstruction of the Gravettian culture by Libor Balák:
We can distinguish distinct cultures going back to the early paleolithic based on what art, jewelery, or tools they have left behind.
Not to mention, there are many cultures that have retained a paleolithic way of life into modern times, like the Sentinalese:
Note that not one person in this photo is dragging a club or a woman by her hair.
It's just a really fascinating and important subject, and more people deserve to know more about it.