Any group of people with power or authority, who are not held accountable in some way, will end up doing bad things.
If you see any group; cops, politicians, priests, judges, jailers, professors, doctors, dentists, business tycoons, psychologists, faith healers, karate instructors, whatever… anyone with authority over others… who is trying to ward off attempts to check on their behavior either is doing something unethical or are afraid they are.
It’s not as if people set out to do bad things, generally, but the first slip happens, and if there’s no blow-back there are fewer reasons to fight against that next slip. If there are rewards for slipping, then pretty soon you have institutionalized secrecy as a rule for group membership…