Whoever said that life is fair?  Certainly not God.  Airplanes crash and burn just as do marriages and future hopes and dreams.  Innocent children in Africa die from HIV as well as the doctor who has spent her life striving to save the lives of her patients.  Never, under any stretch of the imagination, would a sane person ask God for difficulty, for trials, for illness that he or she might learn the lessons of grace and patience which come from facing difficulty and winning the battle.