Maybe this is why:
"The controversy intensified with the publication of Abbey's most famous work of fiction, The Monkey Wrench Gang. The novel centers on a small group of eco-warriors who travel the American West attempting to put the brakes on uncontrolled human expansion by committing acts of sabotage against industrial development projects. Abbey claimed the novel was written merely to "entertain and amuse," and was intended as symbolic satire. Others saw it as a how-to guide to non-violent ecotage--the main characters do not attack people. The novel inspired environmentalists frustrated with conventional methods of activism. Earth First! was formed as a result in 1981, advocating eco-sabotage or "monkeywrenching." Although Abbey never officially joined the group he became associated with many of its members, and occasionally wrote for the organization."
http://en.wikipedia.org/wiki/Edward_Abbey
Your post was removed for the profanity in the article.