IG Farben only bankrolled the Nazis once Hitler was already Chancellor and Goering was the reichtstag president and they started to throw some protection racquet energy about. Yes, the companies were greedy but the Nazi top brass weren't above using mob tactics either. And IG Farben was a predominantly Jewish company, so on shaky ground with the Nazis and they knew it. Their Jewish board was eventually replaced with Nazi puppets.

Smedley Butlers situation is a weird one to equate with Michael Flynn. Banks didn't like that a democratic president was bringing in banking regulations and ushering in an era of socialist reforms. Butler was a socialist. I don't think General Flynn would appreciate being likened to a socialist, but that's just my take.