It's possible that stupid people in government have helped lead to the "5 guys owning everything" though. The world we live in is a result of policy choices, not a natural inevitability. And the people we've put in office over the past 50 years have played a large role. If they were being put in office by a population that was getting dumber and dumber every election cycle, that could certainly be a big contributor to the problems in wealth disparity we see today. I'm not saying that's the case, only that the two theories are not mutually exclusive.