Wow, Shirley. What a question. Explaining the theology behind that here would be a lot to do.

God does not delight in His wrath. He prefers that His people repent and live.

jesus took the wrath of God at the cross. In the old Testament God used violence to rid the world of tribes that were against ands the ways of God. Do I understand . Not really.

I believe the OT is an external reality of the spiritual warfare of the new Testament.

Now: Jesus endured the Fathers wrath and died for all sinners and all mankind.

Theologians say:

He is a God of many chances, offering grace and mercy even toward great evildoers. He told Jonah to go preach His word to the city of Nineveh, warning the people God was going to overthrow their city because of their awful wrongdoings. However, the threat of impending doom woke the people from their evil ways, and they repented their sins. God offered them grace and did not destroy Nineveh (Jonah 3:10).

Other scholars remind us that God, who is holy and all-knowing, discerned the souls of all the people destroyed, and these were not innocents but rather evil enemies of the Lord in a grand holy war. After all, the Canaanites were a wicked people (Deuteronomy 9:4) who regularly sacrificed their sons and daughters in the fire to false gods (Deuteronomy 12:31). Other enemies were known tyrants who viciously oppressed and exploited people.