A common tactic in the Propaganda Wars is to control the narrative.
When you control what is being said, you control the direction of the minds of the masses. Then rewriting history to suit your perspective becomes easier due to less dissent.
We have already seen the press targeted with sanctions, removed from access to the White House and the Pentagon, and directives issued to National Parks and National Monuments (like the Smithsonian Institute), all in the spirit of controlling the narrative and retelling history from a specific point of view.
This is what dictators do. This is what authoritarianism looks like.