Ew.
As I've always said, the death cultists know that they're advocating murder. They just don't care.
He is unresponsive, and practically dead as it is. Pulling the plug will not be murder.
In certain religions you can't pull the plug. You just can't do it. It's wrong.
If someone has been lying in a bed for three YEARS, it is safe to say that there is no hope. Keeping them alive only prolongs the agony of the family, and it prolongs the natural death of someone who should have passed away years before.
My family discussed this issue years ago. We've decided that if something like this happened to us, we'd spend three months on life support, and if, after that time, we hadn't begun to make a recovery, we'd pull the plug.