http://www.youtube.com/watch?v=VGYttXa0d1k
Look, Jeff Cooper was a keynote speaker at the15th Annual Meeting of the Doctors for Disaster Preparedness held in San Diego, California; June 1997!
I see the issue two ways:
1) For the sake of argument, lets say that most doctors are anti-gun. Popular culture does, IMO, portray the medical profession as being anti-violence. Chances are there are some out there that are trying to fit in with this image, because it is human nature to want to fit in.
Also, look at the kind of people that are drawn to the medical proffession - they want to help others, they are intelectual, and possess the patience and discipline to go to school for a few extra years (I'm taking medical terminology this quarter, and that class alone has given me so much more respect for anyone who goes through med school.) The proffession doesn't necessarily atract the kind of people that would be into guns.
On the other hand,
2) Lets say, for the sake of argument, that most in the medical field are pro-gun. Depending on your discipline, the medical field can atract the guys who like the chaotic emergency room enviroment, or aren't afraid of getting thier hands dirty at the Operating Table. They may have a predisposition to being por-gun. Thier brain may be wired like a cop's, or soldiers.
I think its like most things, where you've got the left, right, everything inbetween, and then some.