God uses the wicked to punish the righteous as part of His plan to bring about His Kingdom and to ultimately reward the just. He reassures Habakkuk that all evil deeds are marked and will be addressed, promising that the wicked will be punished and the righteous will receive their reward. This is how God answers Habakkuk's question about why He uses the wicked to punish the righteous, explaining that it is all part of His will and plan to produce the right fruit in the end.

God uses the wicked Chaldean-Babylonians to punish His people Israel, despite their own wickedness. This action perplexed Habakkuk, who questioned how God could use a nation less righteous than Israel to bring judgment upon them. God's response was that the Chaldean-Babylonians, though used as an instrument of punishment, would themselves face judgment for their sins. This demonstrates that God's use of the wicked to punish does not exempt them from His ultimate justice.