There was a big todo about a evidence of cannibalism among some American Indian excavation sites. Human bones with human teeth marks on them, mostly.
Some group group of people is infuriated every time archaeological digs prove that humans were all pretty much uncivilized at some point in history-Brits were upset when it was revealed their ancestors practiced human sacrifice and cannibalism, too-and they are usually pretty realistic in their thinking as far as history goes...
https://www.amazon.com/Man-Corn-Cannibalism-Prehistoric-Southwest/dp/0874809681
Man Corn: Cannibalism and Violence in the Prehistoric American Southwest
and the video of the PBS documentary:
https://www.youtube.com/watch?v=VWbWPgjJ7W0