Sorry I'm having trouble using the software to quote your post. This may have to be klunky.
The gist of our disagreement seems to be centered here:
I can't completely agree with you here because nobody's life is an island. What we do with our lives most often has a big impact on others. So when people commit suicide, it usually leaves a lot of pain in its wake that's experienced by friends and family. After all, they may have invested much in the life of the person who committed suicide, and all that effort will have been trashed.
I do agree with you that we are none of us an island and we have duties to one another. Though I'm no theist I do think we are all part of something greater. I just don't think any of that should require enduring torture when death is near and you're in pain. If you are writhing in pain and your prognosis was day to day, I wouldn't argue with you that your duty to me superseded your urgent need to get free of pain. Surely you wouldn't press for that either if it was someone you cared about.. I mean, you don't talk them into opting out to alleviate the pain you feel through empathy. But if it is their urgent need and desire to escape the pain, how can we not give them our support?
I don't believe we have free will. That's why we need others to guide and limit what we do. Bounds need to be set on our freedoms so we do not violate the freedoms of others.
Well that's a whole other can of worms, free will. I think there is something we mean by that which is captured by the legal definition - essentially, free from coercion. But of course we are not free to choose what we like or who we are, only what we believe and will do.
I'm a lot less inclined to look to external controls.