It happened because of the assortment of abysmally mediocre politicians involved and in no way should have been solely blamed on Germany. This and the resulting Versailles Treaty cemented in the certainty of WW2.
Clemenceau and Hitler should be eternally chained to each other in Hell.
WIKI
The Treaty of Sèvres imposed terms on the Ottoman Empire that were far more severe than those imposed on the German Empire by the Treaty of Versailles. France, Italy and Britain had secretly begun planning the partitioning of the Ottoman Empire as early as 1915. The open negotiations covered a period of more than 15 months, started at the Paris Peace Conference of 1919, continued at the Conference of London of February 1920 and took definite shape only after the San Remo Conference in April 1920. The delay occurred because the powers could not come to an agreement, which, in turn, hinged on the outcome of the Turkish National Movement. The Treaty of Sèvres was never ratified, and after the Turkish War of Independence, most of the Treaty of Sèvres’s signatories signed and ratified the Treaty of Lausanne in 1923 and 1924.
While the Treaty of Sèvres was still under discussion, the Turkish national movement under Mustafa Kemal Pasha split with the monarchy, based in Constantinople, and set up a Turkish Grand National Assembly in Ankara in April 1920. He demanded for the Turks to fight against the Greeks, who were trying to take the land that had been held by the Ottoman Empire and given to Greece in the treaty. That started the Greco-Turkish War (1919–1922), which resulted in a Turkish victory.
https://en.wikipedia.org/wiki/Treaty_of_S%C3%A8vres
Eh... Germany gets the proximate direct cause by propping up Austro-Hungary with the Blank Check promise - but it is true that even with that promise, the hugely entangled web of treaties and intrigue would likely have set something off anyway.