Your analogy is flawed. If someone is a board/director in a company they have additional scrutiny. Why would they ever take that job? The question should be,

Your analogy is flawed. If someone is a board/director in a company they have additional scrutiny. Why would they ever take that job? The question should be, would otherwise great people NOT join the force if such a control isn't in place? Also, without controls - you attract exactly the wrong people (power-hungry bullies).