Counter argument : ww2 was completely irrelevant to all post war progresses, war against communism, which was a mortal threat to capitalism, was the key factor.
During the cold war, capitalism had to provide comfort and progress to people, or people would have turn communist. And so it did. Until it basically won in the 70s.
The idea that society needs war or competition incentive to do anything is the dumbest liberal mind fuck of today. It's completely wrong, but it goes with the ideology that dominates.
Hitler still was crucial for the nazis to take power. His political wits was much higher than any other nazi. He did turn the nazi party from an irrelevant extremist group to a force that could seize power. He didn't do it alone. But pretending that nothing would change without him is like pretending Caesar or Napoléon weren't mandatory to their deeds.
Hitler definitely couldn't do what he did alone. But he was definitely a pivotal factor to make History what it was.