I think eco-fascism in particular is fascinating, because elements of it can take root in otherwise very progressive individuals. And then they go on to spread to crypto-fascism without even knowing it--like the "humans are the virus" thing, which you might chalk up to everyday cynicism.

I mean this is true of all fascisms. I hesitate to call it a natural human disease of the mind or anything like that, but it certainly is a tendency, especially when times are tough.