That is the point—despite all the awful things the Jews have done while turning their backs on God, He is still waiting with open arms to heal a repented heart instead of casting judgment. All hope is not lost. God wants to shower blessings and lessons on those who love him.
Malachi continues to bridge the gap between the old and new testaments. These Minor Prophets begin opening up a new way of thinking and foretells of John the Baptist as well as Jesus. “Look, I am sending you the prophet Elijah before the great and dreadful day of the Lord arrives.” Malachi 4:5