Either way, you should at least agree that going back to pre WWII is disproven.
Not necessarily.
It’s logically possible that WWII turned out really, really, really badly for the the world with lots more deaths worldwide, and that someone in the future calculated all the possible scenarios and determined that the one we know of held the least damage worldwide and, as a result, created the reality we know today. In other words, it could be argued that the war was inevitable and that the outcome we had (as horrific as it was) was the best possible outcome (i.e. that all the other outcomes had far, far more deaths worldwide).
The Wolf