The mystery is what is going through the persons mind at the moment of self execution.
edit: I used the wrong word to describe a final act.
I think you may want "ultimate"? penultimate = second-to-last.
There's always a conversation over whether suicide is rational, but no one thinks to ask if living is rational.
I've never been suicidal, but I've always felt that strong anti-suicide advocates, while strongly well intentioned, might not be fully reasoning out their belief systems. I think I'd greatly prefer to go out on my own terms in old age, without need for qualifiers like pain or disability.
Recognizing the time for your conclusion is a tropey act for old characters in fiction, and implies deep wisdom. But in real life we assume anyone feeling similar has lost their mind.
https://gizmodo.com/the-agonizing-last-words-of-programmer-b...
https://ennyman.medium.com/a-lesson-from-29-golden-gate-suic...
Sure most suicide attempts aren’t done this way but I think statistics like this showcase how many suicides are irrational on some level. If it was rational then you’d think they wouldn’t immediately regret it (unless the regret is irrational I guess).
Source: "Where are they now?" by Richard Seiden
There could even be multiple mechanisms there: "turns out being that close to death is really scary," or "my survival means there is a higher power looking out for me," or "my life flashing before my eyes made me realize something about my life"...
"Nine out of ten people who attempt suicide and survive will not go on to die by suicide at a later date. This has been well-established in the suicidology literature. A literature review (Owens 2002) summarized 90 studies that have followed over time people who have made suicide attempts that resulted in medical care. Approximately 7% (range: 5-11%) of attempters eventually died by suicide, approximately 23% reattempted nonfatally, and 70% had no further attempts."
https://www.hsph.harvard.edu/means-matter/means-matter/survi...