I'm not sure if I should write this here, maybe I don't understand what you're saying...
That said, I know communities of people who have a death kink. They are completely harmless, do not wish real death upon themselves or others but they still have some fascination (i.e. sensual or more) with it.
It often starts at early age - often triggered by stories about witches cooking people, brothers Grimm stories, Romeo and Juliet, playing with dolls like you mentioned etc.
As with many other oddball kinks, I think it can be therapeutic to explore it in a safe environment (fantasy) and may help differentiate fantasy from reality.
Needless to say such communities keep a low profile even on the internet because it's understandably shocking to the general population (or even to the rule34 population).
I'm hesitant to introduce such a thing to suicidal people because who knows, however like I said it can be helpful to explore it and know the difference.