@Albert D3:  I doubt that MK would disagree with you that left wing extremism and violence counts as a violation of civil discourse. He might support the idea behind eco-terrorism (that is, protecting the natural world is extremely important) but not that terror and destruction is an acceptable means to that end. No rational law-abiding person of any moderate ideological bent would. His entire argument is against terrorism and for intelligent, civilized engagement, that allows for constructive, humane, collaborative solutions to the thorny challenges of 21st century life, including the survival of the planet. Eco-advocacy, yes.  Eco-terrorism, no.