This is a typical slippery slope argument, applied only to Congress but not to the judiciary. I could ask, for instance: what next, will judges, on the word of a putative spouse, deny nutrition to alzheimer patients who, on their own, would surely die of starvation? And what of the standard of proof and evidence? There’s nothing in writing here, no living will, no witnesses — just heresay. Is that the standard judges will now use, and if they can use this standard on a matter of life and death, what about wills, trust, estates? Are they all to be decided now based on oral, unwitnessed representations?
The debate isn’t whether government has a role in these decisions, but how government will exercise that role, including which branch of government.