answer:Genetics, upbringing, culture, self-control…aren’t you basically asking what makes people different from one another? The similar situation you’re citing is only one factor among many that affect how people react to things. Take those children of alcoholics: yes, being the child of an alcoholic is going to have a profound effect of some kind. But children’s personalities and life-shaping experiences are different. Children of nonalcoholics also include some who are responsible and some who are completely irresponsible, so the alcoholism isn’t the controlling factor.