Hattie already tells you where to look ... Himmler, Eichmann, Hoess etc SS, Gestapo.

None or all of the average soldiers? If all of the millions of soldiers were busy with concentration camps, who then fought the war?

Personally, I think Hitler had more ill-strucken and submissive admirers who were cold blooded executors than he was a capeable commandier himself.

Speaking openly about Hitler is a personal preference.

My uncle and godfather who was a native Berliner, went East at the very beginning of the war, depoyed with a pioneer battalion. The "Vorhut", comparable to elite Marine units.

Their mission was not to get involved in anything they could avoid on the way East. Their mission was to get as far as possible into Russia, break through Russian lines and attack them from behind. A small battalion, completely on it's own.
One of those after which the term "Himmelfahrts Kommando" was coined.

They succeed, but to present an idea of how scared they were:

They had taken a skeleton from some Biology classroom and hung it from the cannon of leading tank, in the hope it would scare the living ***** out of any Russian they may run into ....

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