In my experience with doctors, they are not all created equal. Just because you have an M.D., it doesn't necessarily make you "right", "wise" or "smart". Trust me, I've seen a few that were "wrong", "thought we haven't made any advancements since they graduated med school", or "probably are whacked out on painkillers or uppers".
My docs get one shot. If I don't like what I see right away, I look elsewhere now.