Here I'll describe the unique set of qualities of Hitler's personality, and then explain why without them Hitler, or anyone else, could not lead Germany so fast to a second war, a World War that shook the world and almost drowned it in blood.
It is my opinion that if the attention and military resources of all the world's other major military powers were not committed to the European war against Hitler's Germany, Japan would have kept its military aggression limited to its never ending war in China, which between and 1931 and 1945 consumed the majority of the resources and attention of the Japanese army and remained Japan's original and main goal.
Causes of World War I - Wikipedia
The First World War has sometimes been labelled, with reason, "a family affair". This is derived from the reality that many of the European monarchies - many of which fell during the war (including those of Russia, Germany and Austria-Hungary) - were inter-related.