A lot of that is correlated with more recreational time, better family lives (probably no one in jail), and higher quality education. This is the same logic the French aristocrats used to justify the oppression of the peasants, reading novels made them "better"
I think it's way worse than that, the only things that people with money/power are better at ... is getting / hanging on to money and/or power.
They're not better at anything apart from that, by any objective measure.