If someone is dependent on government to pay for their medical care, then they should be aware that money is NOT infinite. I’m surprised rationing isn’t even more common. Choices have to be made, especially in single payer systems (we aren’t there, yet, but the federal government is paying for a large percentage of Americans).
People really have no right to demand that other people cover whatever costs might be necessary to extend life for as long as possible. If someone wants no expenses spared, then they need to pay for it themselves or request the (voluntary) charity of others.
To my knowledge, not a one of them has ever said "I've gotten more than my money's worth, from here on out I will pay my own way".