Knowledge of history is important in order to have an understanding of who we are as individuals and as part of a nation. The fact that so much of what we can find in pop culture is actually myth and lies is really disturbing all the more when it comes to history. A lot of people don't have an understanding of relevant historical events and the ruling groups have even weaponized people's ignorance about it. Political correctness is basically the enforcing of pop culture through the manipulation of semiotics.
We have to fight in order to save history as much as we can. The garbage culture I just described is what most children are exposed to and it is where they get their values from.