1. The Germans maintained they were acting in self-defense (which had the won the war, history would duly record — though the surviving Jews would have an oral tradition to the contrary). I believe they also renounced the Kellogg-Brian Pact.
2. The Germans passed a law authorizing the government to take all necessary measures (the “Night and fog” law) and if this was legal, it would be a defense under German law. The Allies disagreed. There’s a good chance than had Rommel become the new leader (in the unlikely event the July 1944 putsch won), he probably would have found many Germans were acting illegally (and one can argue that the Nazis were more afraid of a future German government blaming them for the holocaust than they were afraid of the Allies or the Jews, since they assumed they would be summarily shot if they lost the war – something the US wouldn’t allow). Needless to say, any Germans with “fear of G-d” probably fled the country or ended up being executed (though some survived).
3. From a Jewish perspective, everyone involved in the holocaust was guilty regardless of who gave them orders, though that position is not universally shared by the rest of the world (whose legal traditions allow for a criminal defense based on following orders).