[image caption: a tweet from Ari Dee (@ TheAriDee) that says “For anyone curious, here’s what Six Grandfathers looked like before they defiled it by carving a bunch of old white men into it.” below the text is a black and white photo from LIFE magazine of Six Grandfathers, titled “Mt. Rushmore before carving” that has had “Mt. Rushmore” crossed out and replaced with “Six Grandfathers”. ]
“On October 4, 1927, sculptor Gutzon Borglum began carving the faces of four presidents into the granite of the sacred Black Hills. For the Lakota, the slashing of the stone exemplified disrespect in itself, but beyond that, there was something almost mocking about having four American presidents, all of whom had supported genocidal Indian policies, looking down at the Lakota people.”
I’d say it was “almost” certainly intentional.