If the patient is not expected to ever recover, there’s no point to prolonging their existence. There are also financial and moral costs to trying to keep such a patient alive. Putting someone on life support requires keeping a doctor and nurse available to keep them alive (inspect them for bed sores, turn/roll them periodically, maintain any drug or dietary regiment), as well as occupying a hospital bed and equipment. Those resources cost money, and could be used to help another patient that has a much better chance at recovery.
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