I do not fully agree with your claim but the medical profession along with a few others, like lawyers, are self-regulating industries that set their own rules, including the rules to admission to the club.

I really dislike the idea of a club with legal powers over you, such as doctors or lawyers, that both set their own rules and control entrance to the club.

It strikes me as feudalistic and undemocratic. Oppressive. As an American I find it vaguely un-American!