Obviously this picture is photoshopped, you mouth-breathing troglodytes, it explains. Bad people clearly ginned the story up to create outrage. Next they'll be saying that NPS personnel put up traffic cones on October 1 to block people from pulling over on the viewing spots on the side of the nearby highways:
OK, admittedly, according to Snopes, that one's sort of true.
The National Park Service placed cones along highway viewing areas outside Mount Rushmore, barring visitors from pulling over and taking pictures of the famed monument.
The cones first went up Oct. 1, said Dusty Johnson [South Dakota] Gov. Dennis Daugaard's chief of staff. The state asked that they be taken down, and federal officials did so with some of them. The state was told the cones were a safety precaution to help channel cars into viewing areas rather than to bar their entrance.
"I think reasonable people can disagree about that," Johnson said.
The cones were down again [three days later] as a blizzard hit the Black Hills and plows needed access to the roads, Johnson said. He said the state would be monitoring to see whether the cones are put back along viewing areas. "Once the snow's off the ground, we're going to be keeping an eye on how the cones go up," Johnson said.