Let's not be so selective in our  logic and evidence. For example, science knows for a fact that there were zero indigenous peoples here in North America prior to the last ice age. First peoples is more politically correct but first peoples are directly descendant from Asian Mongolian tribes via the Bering Sea land bridge and even Polynesian peoples by boat.

And then again, let's also start including the crimes against humanity practiced by North America's first peoples upon themselves - their internal wars, such as the Lakotah forcibly taking land from the Cheyenne who had previously forcibly taken it from the Kiowa. How about the Beaver Wars where Mohawk Iroquois tried to take control of the fur trade from the Hurons.  The southwestern Pueblo nation also had to build remote, fortress-like cliff dwellings to protect themselves from warring Navajo, Comanche, and Apache nations. Or how about the human sacrifices of innocents and captives practiced by the Mayans and Aztec nations?