To me it sounds like super rich are the ones afraid what's coming, and that's rise of the poor people. And that's going to get worse when jobs are getting scarce.
It's understandable that Trump wants to protect himself for investigations, as would need to answer a lot.
But FBI does more then investigates criminals like trump. It also protects USA from domestic and foreign terrorism, and has prevented countless of these planned acts. They work with credible sources when it comes to plans of targetting rich people too.
Especially now, when internet responds with joy to murder of UnitedHealthcare CEO, those rich people might want to up their protection with federal joint forces and not just trust their private security.
And since Trump's cabinet is full of Billionaires, i am guessing they feel the attitude towards them and feel quite threatened now.

But yeah, i am sure that they rather dismantle the best option to keep themselves secure.