Mosiah 9:2

2 Therefore, I contended with my brethren in the wilderness, for I would that our ruler should make a treaty with them; but he being an austere and a blood-thirsty man commanded that I should be slain; but I was rescued by the shedding of much blood; for father fought against father, and brother against brother, until the greater number of our army was destroyed in the wilderness; and we returned, those of us that were spared, to the land of Zarahemla, to relate that tale to their wives and their children.

So an army was willing to turn on itself and destroy itself if they would not destroy the Lamanites?

It's hard to imagine that kind of hatred, not only for your enemy, but for your 'friends.' How do you go from disappointment/ disagreement- to killing people who disagree with you?

I sometimes wonder where our society today compares with theirs, then.