Every heart was hardened. Every one.
That is overwhelming.
The Spirit no longer dwelt with them. These were real people, whose lives now consisted of war, killing, torturing, and the sacrificing of women and children
This cannot have been a joyous time for our Father in Heaven as He watched His children digress into such a wicked and evil state.
The Nephites had a choice: they could have either turned to God in their afflictions and sought His will, or they could turn away from God, and with bitterness and blame, harden their hearts. We know this time they chose the latter.
Sad, sad day.