It's the same with benevolent aristocracy, I'm sure there have been good rulers in the past who considered it their duty to serve the interest of the people and be benevolent, however 80-90% (conservative estimate) are not. They see themselves as the pinnacle of humanity and "why not? why shouldn't I do whatever I want? The peasants are wrong!" . It's the same with all positions of power and why there have to be counterbalances like courts and laws to protect privacy.