The people actually responsible for their misery would be their parents. Their parents are the ones who forced them into this hellish world of struggle and strife, of violence and exploitation, of sickness and death.
I'm not a Christian (or a Buddhist, as Schopenhauer was, in effect) and don't believe in a Fallen world. It is "hellish" because some make it so at the expense of others and they are rarely one's own parents (though some parents really shouldn't be..).