Unexplainable Unfair Life

How do you explain why certain people would intentionally cut off their life for some trivial repairable reason while a number of patients lie in hospital beds waiting for that lung or liver donor, hoping that they would be able to buy more time for their kids and family? This irony has started me thinking hard. I have come into my personal conclusion that life is undeniably unfair. Talk about individuals who are strong and healthy up until the next day when they discover from their routine doctor check up that they have a life threatening disease such as a malignancy/tumor. I have heard and known people who never smoke and get lung cancer, people who are very conscientious with healthy living, but get morbidly sick anyways. Life is unfair. It stabs me deep in my heart why these things are happening. Out of the billions of earthlings in our society, why does it have to be the good people who get this life threatening problems and not that junkie on the street who smokes and inhales crack everyday. It doesn't surprise me why depression due to a chronic health condition kills people. Depression hurts. Life hurts. Everything hurts.