While Wilhelm did glorify war and militarism,recent research into his diaries and such show he actually was quite nervous to go about war. To the point just before the armies clashed each other he tried to send telegraph to other European leaders to stop before its too late. In fact he attempted to demobilize the army but by that point all sides' military were so damn prepared to fight there was nothing the politicians could have done to preent a clash. There is also evidence majority of German males were so damn nationalistic they were eager to fight the war. Case in point, remember despite our modern notion European monarchs had absolute power and could do whatever they want, in reality there was a lot of checks and balances as early as the Middle Ages. Not enough to match our modern democracies notion of check and balances, but such that European monarchs had to yield to others authorities like nobles and the pope. Assuming he did have absolute power and wanted war (which I already said modern discoveries dispel as overrated), had Germans been anti-militaristic and weary of war, I doubt he would have sent entered into the war so recklessly. There is only a limit our much a monarch can keep pushing people to war and even armies mutiny when they get sick of it as happened on the French side no matter how nationalistic they are. Even older sources like Alistair Horne's The Price of Glory states Wilhelm's responsibility for the war and how it went is overrated.