ELF are strict believers in The Church of Algore. These eco-terrorists see housing as the worst of America's offenses and often terrorize developers with explosives and fire. They send raiding parties from their homes in Rivendell to strike at the evil housing developments for Saurmons orcs.
They also hate hummers.
ELF sees everything representative of American success as a threat to their way of life and targets what they call "threats to Nature" on fire.