Because if you don't believe that, then you have to decide where the limits are.
That's exactly what the Death Panels are supposed to do.
They will decide what the limits are, and who will and won't get healthcare at the taxpayers' expense.
In the civil war, it was called "triage." The field doctors decided how to allocate their limited resources, who would get care and live, and who would die.
At some point, the Death Panels will allocate the healthcare money and services, and decide who lives or dies. The current reality in the medical field is to highly pressure those with a few months to live, no matter how cognizant they are, to give up and die. From the moment they enter the hospital they are pressured to agree to living wills and other advanced directives, and to die with dignity in hospices -- doctors get drugged-up elderly patients to literally sign away their lives while their while their relatives were not present.
With the Death Panels, patients will not have a choice. When the government Death Panels decide the money is better spent on younger and healthier people, the unlucky ones will not get medical services and they will die.
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Please tell me which of these three alternatives you favor.