That's an effective and viral message because it plays on the fears of people who have spiritual inclinations. Of course in reality, it's remarkably evil in its effects. How many people have died or been disfigured as a result of failure to vaccinate thanks to this claptrap? Spirits of darkness indeed, the greatest of which have a reputation for clothing themselves in light.
He wrote a lot, and on many different topics. If we have to blacklist and unperson writers for any single violation of modern belief, might as well go ahead and toss everything written before 1960 into the fire.
