That level of liberty is something modern society cannot handle accepting in others, even when it's common practice. How many mentions of a Physician evaluating a prospective diver read like the Physician will decide whether to 'veto' diving for him? How often instead do we read 'My Doctor recommended against it and explained the risks to me, but that's my decision and I'm diving' or similar?
After all, would your Physician 'clear' you to smoke, maintain an obese state, drink alcohol, eat greasy fried food...? One argument levied against the 'It's my right' mindset is that exercising your self-perceived right could impact others (e.g.: dive guide rescue effort, cancel others trip short). Yes. So can having a heart attack or stroke driving down the highway.
It becomes a question of degree. I think most of us would balk at an epileptic who still has periodic seizures driving, especially on busy highways at high speed. But the 350 lb. guy with the history of 2 heart attacks and a triple bypass pulling out of McDonalds? Who says anything about that?
Richard.