I think it is more vicious than this, as a powerful person, you want your children to continue in the same sphere. Except that children are not necessarily as g

I think it is more vicious than this, as a powerful person, you want your children to continue in the same sphere. Except that children are not necessarily as good as you. So you create a system where powerful people can put their children and perpetuate the family standing without risks of being overrun by gifted lower class children.