My friend’s husband was in a nursing home after a serious stroke, not expected to live more than a few weeks. He “lived” - if you can call it that, for 16 months. Unconscious for most of that time, being fed a liquid diet through his stomach, arms and legs stiff and contracted.
Every time he developed breathing problems they gave him antibiotics, saying that they “had to keep him comfortable”, even though he was in a coma and his wife had signed a ‘do not resuscitate’ form.
I think that, in his case, it was all about money. His care was paid for by the NHS, and he was very easy to look after. All he needed was to be kept clean, turned over now and then, and have some food put into his feeding tube. They should have let the chest infections take him gently away. Instead they kept him alive as long as possible, for no reason. His wife died only months after he finally succumbed, and I blame the stress she was under for so long.