I think it is really fascinating what a little bit of power over another person does to a person. It can really bring the monster out of some people. I once saw an individual get promoted and they became exactly the person they despised reporting to. They lacked complete empathy, was intolerant and demanded that their staff think and act the way they think and act.
I think it is sad, but power is a huge truth shower; it can bring out the most sinister qualities in people.
I once had a conversation with a supervisor about giving a raise to one of their employees and they decided not to give this person a raise because they did not want them to feel too special. Are you serious? Anytime I have the opportunity to increase the income of another person, I strive to give them what they deserve and what I would want, if I was in their shoes.
Society is a sad place and most people are very selfish.