They're losing their minds because there's no rational reason to keep the current system going...
It's impossible to keep it going at the current pace. Doesn't matter if the wealthy want it to last forever. They can't keep accumulating more and more finite and necessary resources.
Eventually the current economic system will go away.
Just a matter of how that happens, and who is (figuratively and maybe literally) left standing when the dust settles
It's the same as any other group that manages to accumulate this much.
They just refuse to believe it's not sustainable, and if you don't agree with them. Then they fire you if you worked for them, if you were a politician they found a competitor to knock you out of office and say the lies they wanted to hear.
Which is the crux of the issue.
They've spent decades and billions of bribes to make sure there were two options, and both would do what billionaires tell them to. But the billionaires no longer control both parties.
Hell, they arguably don't control either, trump just usually agrees with them on his own.