I suddenly don't understand suicide?

As I do get suicidal at times, I do understand what can drive a person there. For me, it is stressors, lack of. But why do people that have it all, think of suicide?

You may say but who is to say they have it all? Of course no one, but I think, if you have people who love you, money to sustain yourself, people who care, perhaps even a therapist, a psychiatrist, why would you want to die. These are the things people wish they had, or strive for.

Those are things to live for. I can’t even imagine all that I mentioned above. Yet, I see people still just “Want to die”. Why?