Germany didn’t start the war. Austria Hungary did. What a bunch of crap.
And it was Austrians that drove the creation of the Nazi Party.
As the old joke goes, "Austria-Still trying to convince the world that Beethoven was Austrian, and that Hitler was German."
Germany made France pay reparations after the Franco-Prussian War, so this was payback.
Only the Germans who were 21 or older in 1914 really have any responsibility, and even they really had no say in the decisions made in the inner circles of the government. I doubt there are any Germans who were that old in 1914 who are still alive.