The book of Judges is an historical account of the following cycle: Israel is in bondage and cries out to God. God sends a Judge to deliver them by way of His power. Israel prospers and turns away from God. God turns them over to themselves. They deliver themselves back into bondage. There are variations, but the cycle is clear and instructive.
The only difference is that the Iroquois had always been turned over to themselves. God delivered them from their self imposed bondage.
I have a concern regarding your statement, "they clearly had fallen from the noble example of their ancestors." It directly implies that there was a prior time when Iroquois behavior was noble. I don't know, but I sincerely doubt it. The general history of native Americans tribes is that they treated each other with utter cruelty and barbarism. It is complete fiction to believe North America was some sort of Shangri-La before outside influence. It was Lord of the Flies on a continental level.
Regardless, the facts we know indicate that Robowombat's statement is well rooted in revisionist history. Dances with Wolves is fun to watch, but it is fiction.
Always remember most of the Bible was written or rewritten by a bunch of priests to support their supernatural narrative that elevates their class to being the real rulers. The constant anger of the prophets is a classic example of this power struggle for supremacy. When someone uses Bible qoutes to butress their case the appropriate remark is ‘Vere you dere Charlie.’
Well even pagan peoples had some idea of virtue and strived to live up to it at some points but completely abandoned themselves to vice at others. In the specific time I was referencing (1660s), the Iroquois were buying liquor from the Dutch and they went down a dark path of alcoholism and violence that wasn't there in, say, 1630.
I remember reading one Frenchman who admitted that rape was almost completely unknown to the Iroquois. It just wasn't a common vice among them, even though they could be 10x more horrible than the French in other ways. Most of the colonial sources quite readily admitted that the Indians had their virtues as well as their vices. So I can't agree at all with a continental Lord-of-the-Flies characterization.
But read those first-hand accounts for yourself, see what you think.