[balrog666]

They may have detailed records of the people they ate. They were primitive savages that slaughtered babies for their made up gods. The study of these humans is a depressing venture unless you want to puke.

You have a woeful ignorance of history - they didn't do anything a hundred other societies didn't do first.

[Frumious Bandersnatch]

True, but if you were a stranger in the ancient world, which society do you think you would have a better chance of surviving - and even thriving in: Quechuan/Aymyran (Inca), Tenochitlan (Aztec) or Roman?