When someone gives into their illness and S/I people tell each other they would have done something if they had known... people know. They just don't want to get involved. It's too messy.
A lot of the time people really don't know. For a lot of different reasons. For someone with long running depression & S/I? What makes today different than the other 8,000 bad days they've been suicidal and haven't acted? Or if they're being really cheerful, because they've decided to act, people take that as their having a good day, like 8,000 other good days that have happened in the past. And enjoy it with them. So even when someone has a long history of struggling with suicide, it can still very easily catch the people who love them best by surprise. And the gut themselves, tearing apart every nuance, every detail, trying to figure out what it was that made
today different?
There's also a difference between lying, and being wrong. People like to think they know what they'd do in a situation, but until that situation presents itself? They're just imagining. Very few things turn out to be what we imagine them to be, in my experience.
Other times, sure. It's comforting lies people tell themselves to make themselves feel better.
The one facing me currently? That anyone cares enough to learn how to support me.
It's oftentimes the case that the people who care the MOST? Are the least capable of support. Simply because they do care. Their love precludes the objectivity & distance necessary, and makes them
far too vulnerable to being hurt.
So I would really question the premise that if they're not supportive, they don't care, or if they cared they'd learn how to support you.