Lincoln presided over the largest formal mass execution of Native American prisoners in our nation's history. I am told that "no one is perfect".
No one is perfect. Even great people sometimes commit shameful acts. Lincoln’s efforts to ‘repatriate’ freed slaves was based on a very imperfect understanding of the history and needs of freed slaves and, at the time, may have seemed to be actually progressive. Of course it was no more ‘progressive’ than attempting to re-patriate descendants of European of Asian settlers.
It is extremely difficult to come to terms with the limitations of those we know to be great in their achievements to and yet shameful in certain aspects of their lives. George Washington and Thomas Jefferson leap to mind as obvious American heroes with woeful histories of enslaving people.
I am well aware of the hanging of 38 ( one sentence was commuted) hangings of more than 300 Dakota following the Dakota War of 1862. There is very little, if anything, not shameful about the history of White people and their treatment of indigenous peoples in the US and elsewhere in the world.