For a person to be unappreciative of the two people who gave them life indicates they also lack appreciation for the Lord, the source of life.

Such a person is likely a self-worshipping, abuser of others.

This Law, as does all of our Lord`s other laws, has a self-contained reward and punishment encapsulated in it.
Those who honour their parents will be blessed with long life.
Those who do not will not experience long life.

Parents who do not demand respect and honour from their children are setting them up for short lives filled with conflict and disappointments.