The Scriptures indicate that the giants of Genesis 6:4 died out. Genesis 7 tells of a worldwide Flood that God sent to destroy 'all flesh' upon the earth.
God literally called Noah, offering him deliverance from the world catastrophe, and offering him a job of being a physical savior for all of creation.
The Abrahamic Covenant was made with one man, but it impacts all of mankind to the New Heaven and New Earth and beyond, involving billions of people.
The fifth commandment bridges the two sections of love toward God and love toward man. We begin learning righteous conduct at home, with our parents.