The plan would not just be to rewrite history, but to teach new values. It has been touched upon in movies and so on. Todays history would need to be "forgotten"....
The saying is that "those who do not learn from history, are doomed to repeat it." Pointing to the fact that nothing was changed when mistakes did happen.
We are (would be) in a position to change that, knowing what we know now. Knowing what we know not to be true etc.
Again, like in the movies, the power would be in the hands of those who know the truth etc...
Not impossible, but damn near so.....
A whole generation would need "stop talking" for this to work....
Enter the oxymoron, we would, yet again have to "fight for peace..." go figure....