You're missing the point. The healing follows the repentance, and is a display of God's forgiveness. This is everywhere in the OT Prophets, who promised restoration and healing for Israel if they would repent.
I think this is one of the most misunderstood passages in the Bible. Those with knowledge of the OT Scriptures understand that God "devoted some people to destruction," because God passed irrevocable judgment at times. At other times God was willing to "repent" of His judgments. Only discernment by the Spirit knows the difference.
