For example, it was a common practice for the Aztecs to engage in ritualistic wars against their smaller neighbors specifically to abduct captives for use in human sacrifice.

Not to whatabout anybody, but a comparison of murder rates by the Aztecs to the murders of supposed witches by the Franciscan and, particularly, Dominican Inquisitions does not show Europeans in a favorable light. But at least Europeans tortured their victims first. I think the Aztecs preferred to feed and drug them, instead.

Still, if I were looking to pre-contact America for life lessons, I would look at some more northerly tribes, first. But we don't know as much about what they thought.

Your comparison is factually incorrect.

The documented death rate of the inquisitions is on the order of 4500 people over 400 years [1]. That’s a rate of 11 people per year.

Aztec sacrifice estimates are on the scale of 20,000 to 250,000 per year. [2]

In actual fact, the Aztecs are in a far worse light than the Dominicans and Franciscans. The Nazi comparison is valid. There’s no society on earth that would end innocent life on that scale for another 500 years.

[1]: https://history.stackexchange.com/questions/39443/what-was-t...

[2]: https://en.wikipedia.org/wiki/Human_sacrifice_in_Aztec_cultu...

You are perhaps unfamiliar with the quote translated, "Kill them all. God will know his own."

The Albigensians alone numbered more than 4500.