Contradiction with Psalms 103:8
While Psalms 78:21 speaks of God's anger, Psalms 103:8 describes God as merciful and slow to anger.
Psalms 103:8: The LORD [is] merciful and gracious, slow to anger, and plenteous in mercy. [plentious...: Heb. great in mercy]
Contradiction with Psalms 145:9
Psalms 78:21 highlights God's anger, whereas Psalms 145:9 emphasizes that the Lord is good to all.
Psalms 145:9: The LORD [is] good to all: and his tender mercies [are] over all his works.
Contradiction with Lamentations 3:22
Psalms 78:21 reflects God's anger, but Lamentations 3:22 assures us that God's compassions do not fail.
Lamentations 3:22: [It is of] the LORD'S mercies that we are not consumed, because his compassions fail not.
Paradox #1
The verse refers to God's anger and wrath, which could be seen as inconsistent with the idea of a loving and forgiving God. Some people might find it hard to reconcile the concept of divine love with expressions of anger and punishment.
Paradox #2
The moral conflict in this verse could be the portrayal of God's anger against a lack of faith and obedience. On one hand, it emphasizes the importance of trust in God, but on the other, it shows a severe reaction, which can seem harsh and inconsistent with the idea of a loving and forgiving God.