I get this. However, the old covenant mode of law existence was of their own making, not God’s as it explains in Galatians 4:21-31 and Colossians 2:20-23 “Therefore, if you died with Christ from the basic principles of the world, why as though living in the world , do you subject yourselves to regulations, Do not touch, do not taste, do not handle, which all concern things which perish with the using, ACCORDING TO THE COMMANDMENTS AND DOCTRINES OF MEN? These indeed have an appearance of wisdom in self imposed religion, false humility, and neglect of the body, but are of no value against the indulgence of the flesh.”
Maybe many did not know that forgiveness was theirs because they were raised under false beliefs. However, God pleaded with these people many times in the past, through the prophets, to put away such things and return to the faith and the covenant of their fathers Abraham, Isaac, and Jacob,( the foundation upon which Israel was built), and they would be forgiven. But many refused. This is what finally led to their total destruction and annihilation(the lake of fire).
I just don’t see how this has anything to do with the reconciliation of humanity. As I mentioned before, many still preach and follow false doctrines, as they did in the past, even though the fall of Israel is the proof that God’s way of life is the truth. Until one comes to the Jesus way, he/she is not reconciled to God, and destruction still occurs.