God’s anger against our sins is not only justified, it should be expected if God is good by nature. No judge in a civil court would be considered a “good” judge if he allowed crimes to go unpunished. If he is good, he must see that justice is done, and if God is perfectly good, He must see that perfect justice is carried out on the Day of Wrath. The demands of a perfect, unbending Law leave every one of us in terrible trouble. Who of us hasn’t lusted and therefore violated the Seventh Commandment (see Matt. 5:27,28)? Who hasn’t borne false witness, stolen, etc.? The Law leaves us guilty and “brings about wrath” (see Rom. 4:15), and it is that knowledge that drives us to the cross.
Micah 7:9 I will bear the indignation of the Lord, Because I have sinned against Him, Until He pleads my case And executes justice for me. He will bring me forth to the light; I will see His righteousness.