Suicide is a permanent solution for a temporary problem!
Those of us who are not suffering from depression understand that.
People who suffer from depression take things pretty hard. Your view of reality can get warped as well. Life events can build up over a period of years and every person has a limit.
The best example I know of personally is the suicide of my last CO. He carried many burdens as a Marine CO and family man. He was always concerned with the well being of his Marines. His daughter suffered an accidental death at 16 for which he felt responsible. There were other issues after his retirement. He eventually used an M9 pistol at his office to end his life.