Jkarinen, I have dabbled in these sort of issues for many years. They are very complicated. I think the author you quote is an amateur, typically overstating some minor facts in order to make a sensationalist and invalid claim.
Instead of attempting some sort of conclusive rebuff, I trust that you can make up your own mind. Let me just point you to the Holocaust-debate that has been raging for decades between intentionalists (who state that Hitler and his cronies had genocidal intentions from the start and managed to impose them on German society) and functionalists (who state that nazi policy was the outcome of bureaucratic processes and pragmatic decisions throughout 1933-1945). The debate touches on Hitler's role and all other issues mentioned.
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