Nic, while you and I might see it differently, people are allowed to refuse lifesaving treatments with a rational mind. I know (and sort of agree) that JW minds are not working rationally when their refusal is based on blind obedience. But many healthy humans have DNR orders (DO NOT RESUSITATE) for their own beliefs/philosophies about such. And I could honor that, kind of actually have to.
And while your mushroom/blood question is not really appropriate because it's a case of introducing the bullet compared to introducing the kevlar, there are many different answers even to that. If a sickly person wants mushrooms to die peacefully, it's a decision I could abide by. If an over-90 JW wants to just die faithfully, what kind of psychological trauma would giving blood cause to them?
It's a terrible situation. I have actually been on the scene where the sick person needs "heroic measures" and those measures will probably revive them, but there is the DNR plain as day, and there is the family member saying "Ignore it" on one side and the primary care giving family member on the other side saying "Let him go."
Heck, even my sister (who just died a few weeks ago) had a DNR and her ex-husband would have ignored it had paramedics been called a little sooner. And she would have hated him for doing that.
I get that there are many points of view on this one, and it's a tough call. But tough calls can be made different ways by different people.