That's why I said "main motivation", i.e. what actually caused them to follow through. The initial idea wasn't ideological either - not following from ideology

That's why I said "main motivation", i.e. what actually caused them to follow through. The initial idea wasn't ideological either - not following from ideology doesn't mean it's pragmatic (in fact I'd argue those two aspects are orthogonal) and that it wasn't born out of pragmatism only reaffirms my statement that the Nazis were opportunists, not pragmatists. A lot of things boiled down to post-hoc ideological justifications for the personal preferences of Hitler and his ilk. Even the racism was incoherent - it's cliché to point this out but Hitler himself infamously looked nothing like an Aryan übermensch despite the Führer cult treating him akin to a divine figure. This is consistent with research indicating disgust as a strong motivating signal in right-wing politics.