Why do you think, based upon your personal stance, some people are able to overcome SI and others aren't? I have my own theories on this, but I'd love to hear your thoughts
Thanks for asking. My first guess would be emotions. I felt strongly emotional prior to every suicide attempt I had. I felt strongly emotional (after recieving insult from the person whom I deeply admired) before I started working out for the first time. I felt strongly emotional before approaching people I really like.
The common denominator seems evident to me. I feel strongly emotional every time before I intentionally do something I wouldn't normally do, something I would be very afraid to do, something risky, something that requires a huge deal of effort that I'm normally not putting in, or something that puts me into a vulnerable position.
What I felt before my attempts was usually envy for those who appear to be more fortunate than me, and indignation from being treated unfairly by the universe. Exiting would be an act of defiance, saying no to a game that seems to be rigged against me (I'm fine with games being rigged in my favor).
It could be that other people attempt suicide driven by different emotions, like grief (loss of a loved one), shame (humiliation, status/reputation loss), guilt (feeling a burden to others? I don't get to experience guilt much, maybe I'm good at rationalizing my offenses), or fear (impending homelessness or prison).
So in my current eyes, there is this mighty SI, and there are emotions which have the potential to temporarily overwrite SI. People who believe in good afterlife (like heaven) can be driven to die by positive emotions. I believe that my life experience will end and nothing good will come out of it (nothing bad either), so it is likely I that I can only be driven to suicide by negative emotions, or by trying to avoid unpleasant things in life. (Even If there is an afterlife, I'm not sure if its quality (good-bad scale) is affected by anything I do in this life, and even if it is affected by my acts, then I don't see how can I possibly know which acts will make my afterlife more or less desirable.)
Personally, I believe what we call "SI" on here is actually one of the following, or even a combination of several for some people:
fear of the unknown, fear of pain, ambivalence/uncertainty about dying, wanting to stop the pain but not life itself, guilt, or even just chronic suicidal ideation wherein suicidal thoughts have become a coping mechanism that gives the person a sense of control and a feeling of always having an "out" if life becomes too unbearable.
I think perhaps many users on here are chronically suicidal and experience suicidal thoughts regularly as a coping strategy for pain, but are not truly desiring to die 100%, hence the "I tried to ctb but my SI won't let me" or "SI is a bitch" type post that crop up regularly.
Of course, all of this is just my own personal theory, since I cannot possibly know exactly what goes on in other peoples' heads.
That sounds plausible for me too. For now I see SI as similar to emotions in the driving force but it always has the same direction, which is to keep the organism alive. It feels much faster and more basic though. It is the force of similar nature to the one that makes my eyes blink whenever the drips of water spring into my face, or to the one responsible for maintaining body temperature, respiration, sexual arousal, and other basic things.