It is not predictable where marriage would go when we entered it.
Besides, no one can set rules for who should or should not have children. I'd say majority of the families are not perfect, including my parents', my grandparents' and my own.
Life goes on, with no definitive rules to follow and no future to be forseen clearly. So be it. Kids are alright, with the squabbles and whatnot going on around them.