You don't need cybernetic eye implants and immersive propaganda portals to alter history. You don't need to wait decades to have disinformation beamed into your head. You just need a constant stream of misleading information, half truths, and fictions to be promoted, pushed, and peddled until they are accepted as fact.
To use a sports analogy, if since 9/11 Washington has been the globe's cleanup hitter, it not only hasn't managed to knock a single ball out of the park, it's struck out enough times to make those watching dizzy, and it's batting .000. You;d think that someone in D.C. might have drawn a lesson or two from such a record, something simple like: Don't do it!