They fail because of egos and arrogance. This is the root cause of a lot of life's problems. People think they are above it and too smart etc. They hate being "told what to do". An example, I have a family member who will complain about texting and driving from some position of superiority but who does it constantly himself. When challenged with that behavior he refuses to acknowledge it. He believes he is above it, better than those who cause accidents, and only those "lesser" people need to follow rules. It's an incredibly common behavior and doctors are no different...and in some cultures more likely to assert their status.