What I've come to realize over the years is that good people are reluctant to take the job in power, but allow bad people to float into those positions without much thought. That's a simplification, but it takes a warped personality to be able to distance yourself from the social or civic responsibility of having that much control. Speaking a bit from experience, the times when I actually managed a team larger than a few dozens, I couldn't actually cope (internally, not outwardly mind you) without thinking about people's well-being every waking hour. Most leaders with more responsibility above me in work seem to be able to suppress those worries (or maybe hide it like I did). I've come to believe a little narcissism is somewhat required in those roles. You really need to believe in yourself above others. The good folks always seem to step down after they've achieved whatever manner of success they set out to achieve.