There's also the fact that very expensive food negatively affects most of the people at pretty much the same time, hence the food riots that were still a fact o

There's also the fact that very expensive food negatively affects most of the people at pretty much the same time, hence the food riots that were still a fact of life until not very long ago (and they still happen from time to time in places like Egypt or India), but expensive health-care affects just some of the people and more importantly not at the same time, so it's pretty difficult to rally up a mob that would take care of the "healthcare is too expensive problem" in the same way that the "grain is too expensive problem" was being taken care of by the Middle Age crowds.