Pretty much all hierarchies run into this kind of perverse self-selection bias. Power hungry individuals are more motivated to climb the rungs of politics than anyone else. The work involved aquiring the kinds of fortunes that make you able to effect change weeds out anybody who doesn't just care about money. Popularity based positions get dominated by narcissists.

Bad actors are just more dedicated than the good ones. It's a hard situation to fix barring the complete elimination of privileged positions.