Have you heard of Dr. James Carlson? He rails against the medical establishment.
http://drjamescarlson.blogspot.com/He often talks about walking Medical Doctors through basic biochemical processes they
supposedly were taught in school. They all have the capacity to understand when it is clearly laid out for them, but the way they are taught these things is so dogmatic that they would never think to question them on their own. I think this is in large part due to the mentality that anyone who enters into a field with a huge cost / huge barriers to entry necessarily must adopt. Most doctors have spent something like 26 years of their life to get into "the club" and they will be rejected by it if they question the status quo.