Greenpeace activists arrested for banner on Mount Rushmore?

I walked to Mt Rushmore once as a high-school student (32 miles). I would imagine that the Greenpeace activist isn't home grown. I found those types were typically from the city and typically were clueless about the environment they pretended to care about. We South Dakotans appreciate the environment because typically it is our backyard and we protect it because we use it and love it. I have moved to California but still feel protective of the Hills.