Diseases Need Reservoirs
According to the latest issue of Wired, Greg Bear has suggested that the Department of Health and Human Services might want to commission a novel with the following premise:
If we're looking for a contagious mental disease spread by microbes, we must recall that diseases need reservoirs. A disease needs a large population to maintain itself. If it is unique to humans, it's more likely in a crowded city. If if spread by more than one species, it's more like in a richer ecosystem. In other words, you might expect to find a contagious mental disease in big cities and the Global South.
McCann apparently found an actual mental illness, communicated by upbringing — but also by a virus.
Bigotry, it turns out, is a social disease.
It sure looks like leftism is a contagious mental disease.