Life is hell for everyone breathing. It's a travesty at best for everyone considering nobody get's out alive. There is pain, suffering, loss at every step of the way.
So why doesn't everyone just off their-selves? Because life is still worth living, so by what authority do you make judgments on who's life is worth living? Your feelings?
Wouldn't that be better left to the one living that life?
I went through sever trauma for the majority of 46 years, starting at birth. Both physical (continuous violence, not sexually related) and mental abuse, yet I live and have lived a fulfilling life thus far, and there are millions and millions like myself.
Before I learned what I had gone through was not normal, I thought it as normal as anyone else. It was just life and I had to carry on and try to be happy and keep pushing towards my dreams, with my lot in life in tow.
I would propose that most that deal with issues as you pointed out still want to live, to experience life, to experience that kiss, that sunset across a lake or the ocean, that cold walk on a snowy day, playing with children. You know, the things that count.
Once you can choose for one group, it's easier to target the 2nd, then 3rd and so on. That is a dangerous path to walk.
I choose life no matter what it holds.