I think accelerationism specifically refers to doing it on purpose. I doubt many of the decision-makers in WW2 were driven by a desire to elevate and support corrupt institutions as much as possible in the hopes that the corruption inherent in the system would lead to a collapse and people would have no choice but to cooperate towards a brighter and more progressive tomorrow.

And anyone that wants to use WW2 as a model for their theory of change is also (I hope) glossing over the abominable death toll. "Once sufficient 10s of millions of people die, everyone will be so horrified and traumatized by the widespread death and destruction that they'll be have no choice but to collaborate to enact the better world I'm picturing," beyond relying on an n of 1 and ignoring the decades of cold war that ensued, is also...hard to argue is worth it.