[Ann Archy]

They watched that NINJA TERRORIST take off the tires!!

[.30Carbine]

"Reservations" have different laws in place. I could be all wrong about this, but that's my guess. Mount Rushmore is surrounded by Native Land, yes?

In the Treaty of 1868, the U.S. government promised the Sioux territory that included the Black Hills in perpetuity. Perpetuity lasted only until gold was found in the mountains and prospectors migrated there in the 1870s. The federal government then forced the Sioux to relinquish the Black Hills portion of their reservation.
Source