I wont defend Kaiser Wilhelm as a leader, dictators are always douche bags, but as John Keegan discusses in his book, "The First World War", Germany was shackled to the corpse of the Austro-Hungarian empire.
I'm biased but I think that Hitler actually gained his political traction, where it mattered, with the Prussian general staff; His concept of lebensraum was to end the threat of the east forever while regaining lands that been held by Prussians since the 18th century until the end of WWI; Nations surrounded by military threats always militarize and act aggressively.
Now, if you say WWII was inevitable when it came to a conflict between the United States and Japan then you have position based on United States policy for about a century but the United States general staff developed two war plans for Asia...One with Japan and the other for a war with the Commonwealth of Great Britain. When the United States decided to become a colonial power in Asia we had to prepare for conflict with other colonial powers in the region.