Monstrously evil children of Satan. These people make the Naxis look like errant Boy Scouts in comparison.
Luciferian doctrine is the anti-life anti-genesis teaching glorifying death and self-immolation. Teaching that people are a disease that must be eradicated as a plague on this planet could have come directly from the lips of Lucifer himself at the outset of his rebellion in Genesis.
This crap is wrapped in just enough junk science for these idiots to pass it out their mouth with a good conscience. The motivation is hatred of mankind, not a concern for "the planet." That's gibberish and religious nuts of all flavors have used equivalent excuses to act out their aggressions on their fellow man for thousands of years as an exercise in their own vanity.
"Not only am I the good one, it may be necessary for me to kill all the others, because my motives are pure and unsullied. No mere psychotic, me. I do these things in the name of justice and truth, not out of my own rage and inhuman viciousness. It makes me sad that I have to exterminate all the human race to achieve a great good."
The madhouses have overflowed with identical sentiments from all manner of lunatics for thousands of years. If you wanted to avoid a strait jacket, you just wrap these exact same ideas in some eco-babble. Bingo, a loophole that exempts you from traditional moral codes like that pesky Ten Commandments. "This is an extraordinary situation and I can't be bound by mere mortal appraisals of right and wrong."
All these people are the same old nuts but in new pretentious flavors. Eco-warrior and pseudo-Marxist. Now I can conduct my anal impalings and beheadings of children with a clean conscience, because my motives are purely altruistic, you see.