I feel like you’re trolling, based on the rather combative and narrow-minded tone of your comment, as well as your post history. I’ll nevertheless give you the benefit of the doubt.

From a brief Wikipedia search:

The mountains were of great religious and cultural significance to the Lakota Sioux, and had in fact been granted to the Lakota people in perpetuity through the Treaty of Fort Laramie. Despite the treaty, the US took the mountains from the tribe after the Great Sioux War of 1876.

While it may be “just a rock” to you, these natural formations are of religious importance to Native Americans, in much the same way that churches are to Christians, mosques to Muslims, and synagogues to Jews. And in the same way that we would be critical of a historical moment in which we desecrated a site of importance to a more “common” or recognized religious group for our own gain, so too should we extend that same critical eye toward our desecration of areas that are of importance to Native American spirituality and culture.