I think the prevention of the collapse of medical care is a worthwhile government goal. Prior to the vaccines our medical care system was on the verge of collapse. The areas remaining under vaccinated are still in danger of having impacted medical care. People are dying from non-covid illnesses because they can't get the medical care they need due to the medical responders being overwhelmed by covid. The vaccines have made it so that the breakthrough cases are mild and generally don't require hospitalization. This allows us to get our medical infrastructure back on track.

Having said that, medical infrastructure collapse is on a county basis. Maybe vaccine mandates should be handled at the county level?