I'm pretty sure this is the correct and intuitive reason. In a competition to be 'ever above everything else', tragically it selects for the most pathologicall

I'm pretty sure this is the correct and intuitive reason. In a competition to be 'ever above everything else', tragically it selects for the most pathologically ruthless behaviour pattern, be it Musk or Putin. If there were a contestant even more unscrupulous than you, he'd take your place. So, as long as we allow/tolerate obscene wealth, we invariably get this. And if we try to avoid it the wrong way, we get Stalin.