I understand your point, but strong disagree from experience.

What do you think happens to people who want to do good by approaching positions of power? In my experience, friends who became teachers or cops, they either became evil/abusive themselves, or they were pushed into depression by social exclusion and either left or killed themselves. These are some of the jobs with the highest suicide levels, precisely because some people came to do good while realizing the systems in place made it entirely impossible.