What casual explanation for the german actions in world war 2 is accurate

Basically Hitler came into power and thought that the "Master race"(Arian race - blond hair, white, etc.) was the only race that should have power so he tried taking over the world as quickly as possible because he knew that the longer the war lasts, the less likely they would win.

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.