Ah. Jungian. OK.

I disagree with several of your points:

" people owe things to people.". - I think personal debts are completely subjective and you don't owe it to your family to always be there. Mental illness is an illness. Like so many others, it can kill you. If the suicidal had some other illness like heart disease or cancer would we blame them for dying? Maybe we would, because the more we learn about medicine the more responsibility for our health is placed at our feet when the reality is that where, when, and to whom you're born has a greater impact on your longevity and lifespan than anything else.

"The foundation of health care as an institution is understanding this concept that no one is an island and that we all need help" - Im not in Healthcare but Im not sure that is the foundational concept behind all of it exactly? Where did you get that?

"It is selfish to leave your brains on the floor to be cleaned up by someone (gun shot) or to have your mother find your hanging body in a tree next door to your wife who was sleeping, revealing your body hanging in regiamortis to your kids. That is profoundly selfish.". This is true but once again, if it was some other illness we wouldn't call these people selfish. I had to see my mom dead, sitting up in bed, because that's how she died in her sleep, sitting up, with her hands reaching up toward her own chest/throat. People die suddenly every day and other people find them that way, sometimes by accident, sometimes not. It doesn't have to be a suicide to be their own fault. It doesn't have to be suicide to traumatize your loved ones. People OD by accident. Is that a suicide? Is that selfish?

Full disclosure, I don't think people have free will. Which might be the simple disagreement at the root of this if you're a fan of Jung.

"major drivers are shame or chemical imbalance that be *easily* improved through equitable healthcare access" - ok 2 things. Easily? No. Equitable? Also. No. That's not a thing.

"Ultimately we don't agree on the social-moral injustice that makes it selfish and cowardly and you prioritize the ultimate personal sovereignty- damn the train driver who watches you walk in front of the train or the first responder who puts you in a body bag extracted from around a tree. Because your personal sovereignty is more important then these people. Or you just don't want to consider it: i.e we are all islands, we are not actually connected to each other.". - not quite. I think suicide is a reasonable course of action for some people in some circumstances. I also think planning ahead is a good thing and can mitigate some of this. Suicide doesn't have to be sudden, violent, and tumultuous and traumatic for everyone left behind. A plan, conversation without judgement and threats of forced psych analysis can make it much easier. I think we, make suicide the problem that it is. I wouldn't walk in front of a train or crash into a tree. The times when I felt I wanted to, I was definitely not thinking about first responders but not because I felt I had a sovereign right to end my life - that doesn't enter into it. When you can't fathom living anymore it's because you feel trapped. You feel the farthest thing from personal sovereignty. You feel your future is set in stone, you have no means to change it and no reason to think it will improve on its own and the condition you are in is no longer tolerable.
I like to think if I ever was to kill myself it would be well thought out and planned and discussed with my family ahead of time. That isn't very common around here, but I wouldn't want to do it the more selfish ways, suddenly, no warning, leaving a mess behind. Idk I'm tired and rambling now.