There are fair amount of stupid people in the society. They all become stupid parents. It is wrong to assume that these stupid parents will become wise when they get to their old age.
I am not at all saying that old people shouldn't be taken care by their kids.
It is hard to imagine a A Kind, loving and sensitive old parent not having any one to support at the old age.
But in reality not many old people learned about kindness and Love when they were young.