Those who say that the God of the Old Testament is “vindictive” should also know that the Lord is merciful, gracious, longsuffering, abounding in goodness and truth. He will forgive sin, but those who refuse His mercy offered in the gospel will reap His judgment. He will by no means clear the guilty. Without His intervention through conversion, the sins of the fathers (immorality, drunkenness, physical abuse, divorce, anger, racial prejudice, blasphemy, etc.) are often passed to the next generation.
Exodus 34:6 And the Lord passed before him and proclaimed, “The Lord, the Lord God, merciful and gracious, longsuffering, and abounding in goodness and truth, 7keeping mercy for thousands, forgiving iniquity and transgression and sin, by no means clearing the guilty, visiting the iniquity of the fathers upon the children and the children’s children to the third and the fourth generation.” 8 So Moses made haste and bowed his head toward the earth, and worshiped. 9Then he said, “If now I have found grace in Your sight, O Lord, let my Lord, I pray, go among us, even though we are a stiff-necked people; and pardon our iniquity and our sin, and take us as Your inheritance.”