Respect for the elderly, for rich people or people in power is common. Our lives are governed by these norms. They stop asking because adults either do not have enough time to explain, or don't know the correct answers. Adults can only say that things should be happening in certain ways. Children know that adults want them to follow certain social principles without question.
People consider family as the foundation for social values.
Children accept this idea too, if their family life is supportive. But for children whose family life consists of only neglect, abuse, and indifference, and is a cause of endless pain or trouble, it becomes meaningless. Even in such bad family situations, most children accept their family life. But others decide to run away by themselves or under friends' influence in order to avoid trouble from the family. Not all street children left their families because their parents did not take care of them.