Although he was raised in a large family, after becoming involved in the environmental movement as a college student in the 1970s, Knight attributed most of the dangers faced by the planet to human overpopulation.
After coming to this conclusion, he joined the Zero Population Growth organization and chose to be vasectomised at age 25. He later concluded that the extinction of humanity would be the best solution to the Earth's environmental problems. He believes that this idea has also been held by some people throughout human history.
Save the Planet, Les. Off yourself.
They taught that the principal sin was procreation, since it entrapped more good souls in evil bodies; on the other hand, they hailed as the highest virtue, voluntary death by the refusal of food and drink.
They hoped for the entire extinction of the human race. What a horrible group.
They were pretty much defeated by the Cathar Crusade of the 13th century, which was, on the other hand, a horrible thing in itself.
And to be lobotomized shortly afterward. Or before ...