Hitler's goal or objective--was mass-murder
Richard A. Koenigsberg

Historians desperately try to treat Hitler as if he were a rational thinker. They write until they are blue in the face about "conquest" and "living space in the East." People embrace Hitler's fantasy of "conquering the world." The wet dream.

Endless documentaries portray the ebb-and-flow of victory and defeat, the frenzy of collective excitement," the rocket's red-glare the bomb's bursting in air: the traditional narrative--fantasy--of war as a realistic endeavor.

However, Hitler fundamental objective was to kill as many people as possible. His goal was mass-murder. He wasn't killing people for the sake of achieving something else. He wanted to bring death into the world, and so he did.
Richard A. Koenigsberg at the Holocaust Conference
Koenigsberg, Harry Toteberg,
and Ernestine Schant-Bradley.
Richard A. Koenigsberg at the Holocaust Conference
Koenigsberg with Jack Fischel, and Schant-Bradley (with a copy of Koenigsberg's Hitler's Ideology).

50 million people or more died as a result of the violence that Hitler unleashed. What Nazism came down to—after all is said and done—was "Die, or we will kill you."

One can speak about conquest, or living space, or whatever—until one is blue in the face—trying to persuade oneself that Hitler had "rational" objectives. The reality is that Hitler's primary object was...mass-murder.

Historians try persuade themselves that the dying and killing that occurred during the Nazi era was in the service of trying to achieve something real. 

Wouldn't it be more parsimonious to hypothesize that the murder or death of as many people as possible--was what Hitler wished to achieve?