You've talked about both incest and CSA as things people don't like thinking about for broader reasons than just 'ew' but is it the same way with suicide? Since you've dealt with suicidal thoughts, why are some people trying to "raise awareness" but never want to discuss it?
Suicide is often treated as a mental health problem. As such a suicidal person will often be dragged into a hospital for a mental health evaluation, that will proceed to do fuck all but hold them until their mood evens out.
The problem is that it's not a psychological problem. It's a sociological problem.
There are mental illnesses that can suppress or inhibit the base desire to life that keeps most people off the ledge, but they are not responsible for the situations that brought them to the ledge in the first place.
As a kid my parents took me to doctor after doctor trying to find out what was wrong with me. The doctors would ask me "why do you want to kill yourself?" And I gave the same answer every time: "Everyone treats me like shit no matter what I do. My parents, my teachers, they're always angry with me even if I behave. Nothing makes them stop insulting or hurting me. I get bullied at school, casually insulted at home, and my father uses child abandonment as a threat very regularly. And my behavior does not affect any of it. What else do you expect me to do?"
Not as eloquently, obviously.
And this would go in one ear and out the other, while my parents chased more red herrings out of sheer, overwhelming denial. I currently, to this day, do not know if any of those doctors or care workers mentioned to them that how I am treated at home is the likely cause. If it ever happened, it was ignored.
If the reason for someone trying to end their own life is "I lost my job, and now I'll likely be homeless in a week" what the fuck do you expect a hospital or a psychiatrist to do about that?
People focus on mental illness, a decidedly rare lone cause of suicide, because otherwise they have to ask themselves uncomfortable questions about things that don't have easy fixes.
And if you happen to be the reason someone wants to end their own life, that horseshit is very reassuring isn't it?