I do believe however, that an individual can make a decision before hand, if their brain is dead and death is imminent and the only means of life is a ventilator or heart lung machine, that it is okay for that individual to have requested legally beforehand to be denied that means of support.
That is a personal decision that I would not stand against, whether I would choose that or not, and I do not believe it is murder to not provide that level of support in those circumstances if the desire is made known before hand legally. Just my opinion.
That's a far cry from ordering your death from dehydration/starvation in similar circumstances. I doubt you'd get much disagreement from anyone on respirators and heart/lung machines.