Isaiah 1:7 KJB
Except for a small remnant that worshipped God alone, the whole land of Judah had turned to idol worship and evil. God used His fiery wrath and war to cleanse His land and restore it to the worship of Him alone. God allowed Judah's enemies to burn their cities to punish Judah for its sins and evil. God had to let His people know that sin and evil causes pain and destruction. God had also protected His chosen people from also turning to evil and idol worship because if they submitted to the darkness of evil, then the whole human race would be in danger of becoming utterly destroyed by evil. When the Babylonians finally captured Jerusalem, God had them to deport to Babylon mostly the evil, idol worshippers, but also some of His remnant who worshipped Him alone. Most of the remnant kept the faith in Babylon, and when God caused them to return to Jerusalem after 70 years, they rebuilt the Temple and the walls. If God's remnant had been persuaded by their fellow countrymen to turn to idol worship, they would have been more likely to do so, but if they had been forced by foreigners to worship idols, then in defiance, they would have been inclined to remain faithful.
God's use of His fiery wrath as one of His methods He uses to purify His people indicates God's reason for His punishment of His people. God punishes His people for their sins and evil to cause them to suffer so that He can correct them and return them to faith in Him which will eventually free them from all suffering. But they must return to faith in Him as their Savior who sacrificed Himself for them to save them from all sins, evil, eternal death, and the Devil from whom they are too weak to save themselves. Habakkuk 2:4; John 5:24; Revelation 5:11-14; Romans 5:6-8 (KJB).
God creates humans in His image to be good and creative. Genesis 1:31; Genesis 1:26-27 (KJB). God loves His entire creation. I John 4:8-10 (KJB). God's Love can never fail. I Corinthians 13:8 (KJB). Because God's Love can never fail, He will save His entire creation from all evil. Revelation 21:1-5; I Timothy 4:10; Matthew 15:13 (KJB). Jesus referred to Psalm 82:6 when He taught that all humans are little gods. John 10:34-35 (KJB). God creates all humans to be little gods which can only mean that all living humans are the children of God. Psalm 100:1-5 (KJB). All living humans are forever alive in God's sight. Luke 20:38 (KJB). Just as all living parents would do anything within their power, including sacrificing themselves, to save their children from destruction, so God has done everything in His power, including sacrificing Himself, to save all of His living children from the utter destruction that the Devil plans for them. Since God loves all of His living humans, then how could God do less than that which He has put into the hearts of loving parents to do.
When Adam and Eve sinned, God told the Devil that He would utterly crush his head and destroy him forever, but God gave only temporary punishments to Adam and Eve because God knew that His Son would save the entire human race from the eternal death that had been planted into their beings by the Devil. Genesis 2:17; Genesis 3:14-19 (KJB). God cursed the Devil, but He did not curse Adam and Eve. Genesis 3:14 (KJB). God made Eve the mother of all living humans, and all humans live forever in God's sight. Genesis 3:20; Luke 20:38 (KJB). All humans saved by God's grace suffer only a temporary punishment for their sins when they die because their souls and spirits go directly to Heaven. John 5:24; John 17:24 (KJB). All living humans who die in their sins whom God must consign to one of the three regions of death will suffer only a temporary punishment for their sins and evil because Christ will visit them in the end of the world, and He will cause them all "on the earth, and under the earth," to repent and return to faith in Him as their Savior so that He can use His fiery wrath against evil to dissolve their beings to separate their repentant, living natures for Him to recreate with new bodies to live forever on His recreated earth, and He will cast their dead and evil natures into the eternal lake of fire. II Peter 3:9-13; Matthew 15:13; Matthew 13:36-43; Luke 3:16-17; I Corinthians 3:11-15; Psalm 75:3; Philippians 2:9-11; John 5:28-29; Revelation 20:5; Revelation 21:1-5 (KJB). The first death is always only temporary, but the second death is the utter destruction of eternal death and all evil itself. Revelation 21:8; Revelation 22:11-12 (KJB).