Watching her wheeled out of that hospital room heart still beating was certainly the hardest moment of my life so far. We never saw the actual 'plug' pulled and i actually prefer(red) it that way.
I deeply empathize that the decision was all on you. doing it collectively was a hair easier. hope your emotional/personal recovery has been as swift as possible.
I lost one of my closest friends a few years ago to an accident but was heartened to know that his organs went on to help others.
I carry an organ donor/DNR card with me just in case, if my brain is kinda dead or even if my heart is not beating, just do whatever with the body.
That's life as we know it, the world will keep going.
Living wills are legally binding documents: http://info.legalzoom.com/living-wills-binding-documents-220...
It's also the family, not the person having written the will several months or years ago, that has all the latest details on the condition and the options.
And on the other end of the spectrum, you have people in suffering with consciousness who wish to be euthanized.
There's may be no "one size fits all" morality to be found here.