Seek good and not evil, that you may live; And thus may the LORD God of hosts be with you, Just as you have said! (NASB)
God that is love is also a God that is righteous. In the book of Amos God outlined the sins of the nations including Israel and Judah.
God warned of judgement in order to bring about repentance in the people. If the people repented they may have lessened the penalties of judgement or possibly avoided judgement altogether as the citizens of Ninevah did in the book of Jonah.
It is this same way for Christians and spiritual Israel today. God is patient and merciful but if we continue in sin God will bring His justice. Decide this day for yourself to seek good so that you may live!
Preparing for the soon return of Jesus Christ, praise our Lord,