If you cut yourself off from human contact and just work with machines all the time, you cannot work with people anymore. This demonstrates the importance of having contact with people. Living alone doesn't contribute to the development of our heart and is therefore not advisable. In many families the parent-child relationship isn't very good. The parents often say they must earn money to support their family, so they work day and night.
Some people have two jobs, or husband and wife both work and the children are often alone.
In such a situation the contact between parents and children constantly decreases. This is why parents cannot control their children anymore. They don't know their children and therefore have no base upon which to control them. This lack of relationship between parents and children causes serious problems in society. Children don't have a good example of harmonious life in their parents, and thus cannot live together in harmony with each other.