Germany, was in no way responsible for the First World War, the war was started not by Germany but by the Austrian invasion of Serbia, to say that Germany was responsible for a war that it did not even start is ridiculous. The War was the perfect excuse for Britain and it's allies to address its issues with Germany's growing navy.
Adolf Hitler was not in power during the First World War, Kaiser Wilhelm II and his generals Hindenburg and Ludendorff were in power. Adolf Hitler was a mere officer during this war. What you are suggesting is that I should just that your word when you say that Germany was responsible, I would like some hardcore evidence please.