They can't acknowledge that Indians were not the first native Americans.
It would damage their victim status.
ding ding ding ....... winner
You know, I've often wondered about "native Americans". Isn't anyone born in North America a native American?
On the other hand, maybe you're not a native if your ancestors came from somewhere else, in which case nobody, but nobody, is a native American.
I propose a solution. We have African Americans, Caribbean Americans and European Americans. So why don't we call those red guys "Siberian Americans"? Because (a) it's the truth, and (b) it would irritate the H* out of them.