Hitler didn't use Nietzsche as a "justification" [particularly as Nietzsche was not then considered a legitimate scholarly philosopher]; Hitler rather read Nietzsche in his early days, as did Mussolini, before he even knew what he wanted to do with his life.
Also, Nietzsche was called by the British etc., "The man who caused the FIRST world war", so Nietzsche's name was linked with German Militarism long before the Third Reich.

It was the Allies who imposed "Unconditional Surrender" on the Germans! It was the British who kidnapped the peace envoy Rudolf Hess, and still persist in a cover up of that act!
It was Churchill who ordered the bombing of German civilian targets to get Hitler to retaliate in kind!
The Allies included the Soviet Union whose record of mass-murder far exceeds the supposed German record.
Anyway, 'Surrender' is Nihilist - fighting to the very end against insuperable odds is heroic.