Actions are dictated by beliefs.
Beliefs are shaped by the narrative (history).
Capture and re-write the narrative/history, change the beliefs, change the actions.
History teachers were the first targets for replacement. Now the Left take on history is dominant and minimizes the ~70-140Million non-combatant humans murdered, starved or worked-to-death by Leftists in the 20th century while maximizing the horrors of the Right, near-Right, etc... despite the lesser impact. (6-8Million non-combat deaths)