Through Satan’s deceptions, the darkness of misapprehension of God has enshrouding the world. Fallen humanity has lost the knowledge of His character thus it has been misunderstood and misinterpreted. Instead of believing that God is always "kind to the unthankful and to the evil", we have believed that God is a stern judge and that His justice demands the unleashing of His wrath to destroy us from off the face of the earth. Just read what renowned atheist Richard Dawkins has to say:
“The God of the Old Testament is arguably the most unpleasant character in all of fiction: jealous and proud of it; a petty, unjust, unforgiving control-freak; a vindictive, bloodthirsty ethnic cleanser; a misogynistic, homophobic, racist, infanticidal, genocidal, filicidal, pestilential, megalomaniacal, sadomasochistic, capriciously malevolent bully.” (The God Delusion)
Most people, including Christians, have adopted and believe in a paganized system of religion which teaches God’s wrath must be appeased in order for Him to forgive us. This false belief then goes on to teach that, because God loves us so much, He killed His innocent Son instead of killing us, thus bringing satisfaction to His wrath and justice. However, the truth is that Jesus actually died of INJUSTICE committed by man influenced by Satan (see, Exodus 23:7; Deuteronomy 27:25; Proverbs 17:15,26).
Also entwined in this false idea concerning justice and mercy, it is taught that Jesus didn't come to save us from sin as Matthew 1:21 tells us, but actually came to save us from an angry God. This is exactly what Don Carson teaches on page 40 of his book, Romans:
“It is commonly held that we need to be saved from our sins, but the sobering truth is that we need to be saved from God Himself, for His anger is personal and active.”
Now, of course Mr. Carson would agree that sin is an issue that we need to be saved from, but his point is that sin is only an issue because it angers God (the Lawgiver) and now He must discipline, or even kill, the guilty party with legally imposed punishments, therefore, we really "need to be saved from God Himself, for His anger is personal and active."
These false ideas of God abound because fallen man looks at God’s “judgment” and automatically thinks “condemnation” coming from an angry God. Good thing God comforts us by saying:
“For My thoughts are not your thoughts, neither are your ways My ways, says the LORD.
For as the heavens are higher than the earth, so are My ways higher than your ways, and My thoughts than your thoughts.”
(Isaiah 55:8-9)

Mankind is to discern (judge) how God’s wrath/anger, justice, and vengeance is different than ours; “for the wrath of man does not produce the righteousness of God” (James 1:20).