Neurologically.

There are some great studies using brain scans that show when you give people extra privileges, even in limited contexts like games, the empathy centers of the brain are supressed and show weaker activity.

Higher status individuals regularly fail to read emotions as well as lower status people do. Brain scans also show that power makes your resource reward centers more active and makes you less able to regulate these kind of impulses.

Power makes humans cruel, selfish, greedy and impulsive. It’s how human brains work. Heirarchy and justice are mutually exclusive.