It’s not that you are completely wrong in anything, but:
at the end of WW1 in order to preserve German bourgeois rule
I’ll just inform you here that German aristocracy and “bourgeoisie” are usually used as antonyms, not synonyms.
Also Germany was starving, the logic was that they can’t afford more chaos, even if it means conservatives.
Soviets did the similar thing with GDR and Hungary and what not in the Eastern block. Though of course they preferred their existing communist buddies who somehow survived the 30s and 40s.
USA wouldn’t have such still already existent friendly factions, so they tried to grow some new ones, initially from people who’d be moderates in former regimes.