Why doesn't America do something more about the problem?
When Moore was in France in the movie, he asked a man what the French people would do if the government decided to bring in a health care system like United States's. The man said that if the French government tried something like that, the people would not stand for it, and there would be a revolution.
But how Americans do not think that way? They believe that the government can make any laws they want, and that's that. They already proved that's how they think after the government manipulated them into going into Iraq, also covered by Michael Moore in Fahrenheit 9/11.
So why don't American actually attempt a coup and take over their own government? Start a revolution. Otherwise things will continue, people will suffer, and doctors will continue to profit. So if any change is to be had, it's by a revolution, and any country where the citizens felt pressured enough to take over it's own government has realized that.