Within boundaries. Kevorkian went to jail for "honoring wishes." My wish, if it comes down to a choice between going without food and water, and going without shelter from the freezing cold, is to be left outdoors to freeze to death. It's more humane than starvation.
I think I do understand. It is human nature to rationalize unethical decisions.
My aunt was dying of ovarian cancer. She had tried everything and there was no hope. In the end she was vomiting feces, which I had not know was even humanly possible. It was the worst death I've ever witnessed.
Doctors ultimately inserted a feeding tube. She insisted that it be removed and stopped eating or drinking by mouth, which she was still capable of doing, although with disasterous results. Within a short period of time, she never struggled again or seemed to have any pain and died quickly after that. It was a blessing.
Were there other ways to help her over those final few weeks? Unquestionably. But those other ways are considered unethical.