Thank you for a wonderfully well reasoned and beautifully written explanation of a very difficult situation. You have said much more cogently than I what needs to be said
My father resisted God for most of his life but came to know Christ just before he died (when I was 15). After watching the suffering he endured, I figured out that I didn't have it in me to make that decision for other people. If he had wanted to end his own physical suffering then I don't think I could have said "no" (he was battling cancer for the 4th time and was losing sorely). My mother had died 4 years prior. At the age of 15, I had to make the decision to remove him from a hospital that was keeping him doped up on morphine so he didn't complain, and move him to a hospice that allowed him some quality of life (building his model airplanes, taking daily walks), even though he would have to deal with some pain.
The hospital could have kept him alive longer with insane amounts of pain medications and drugs, but I knew on the first night he was in that hospital that he wanted to "go home". One of his friends gave me a ride to the hospital to go see him, and he didn't know who I was and he kept asking when he would see my mom.
As much as I loved him, and as much as I still miss him now at age 37 (and knowing his grand-daughter will only ever know him through what I tell her), I know that he died with dignity and on his terms, and he is with the Lord. One day I'll see him again, and I can't wait for that.