many patients die through sheer medical incompetence
.. but that still has nothing to do with the principles of my particular argument. If it has any relevance at all here, it would be just to point out (as you do) that we have limited social/medical resources, which should then be allocated carefully - and so maybe feeding tubes should miss out and be discarded. But I prefer to keep that argument to one side for the time being, and focus on the basic moral/ethical principles of the situation - which BTW you also addressed very well in your other post above.