Yeah, somehow that beautiful, human rights oriented culture tends to get forgotten in the greater quest for “social justice”, doesn’t it?
Here is my short list of how the Indians loved each other and only did the Happy Dance till the evil White Man arrived.
https://frontierpartisans.com/3942/crow-creek-massacre/
https://www.academia.edu/7907221/Mass_Grave_at_Crow_Creek_in_South_Dakota_Reveals_How_Indians_Massacred_Indians_in_14th_Century_Attack
http://www.dickshovel.com/scalp.html
http://westerndigs.org/skeletons-in-utah-cave-are-victims-of-prehistoric-war-study-says/
https://mcclungmuseum.utk.edu/1991/12/01/scalping-victim/
http://westerndigs.org/infamous-mass-grave-of-young-women-in-ancient-city-of-cahokia-also-holds-men-study/
http://westerndigs.org/mass-grave-of-prodigal-sons-in-california-poses-prehistoric-mystery/
https://www.archaeology.org/news/2269-140630-colorado-torture-evidence
https://anthropology.net/2007/07/16/parallel-life-and-death-1275-ad-massacred-gallina-and-vanishing-anasazi/
https://ancientstandard.com/2007/07/17/csi-new-mexico-%e2%80%93-possible-genocide-ca-1275-ad/
https://archive.archaeology.org/9709/newsbriefs/anasazi.html
https://anthropology.net/2007/07/16/parallel-life-and-death-1275-ad-massacred-gallina-and-vanishing-anasazi/
https://www.ohio.edu/orgs/glass/vol/1/14.htm
And again, this is just my short list. I have many more of inter-tribal warfare before the white man showed up on the scene.