The thing is, nobody ever said billionaires were smart. A lot of people conflate being wealthy with being intelligent, and that’s simply not the case.
The fatal mistake the billionaire donor class is making here is that they think Trump can be controlled if he does win. They aren’t worried about fascism because money is the real king of America and always has been.
And that line of thinking is solid until a fascist dictator who doesn’t want to give up their power or have it limited by anybody else decides that the wealthy are no longer their allies and has the secret police “deal with them”.
At the end of the day, that’s the main takeaway here. It’s not so much the men themselves, but the people they intend to appoint to positions of authority. Biden will appoint experts and professionals to run the country for him. Trump will appoint sycophants and yes-men to do whatever he wants to do, even if it flies in the face of reason or standard procedure, and unlike last time he won’t allow anyone who isn’t 100% loyal to him to work in his administration.