It's an illusion and a delusion.
A single family can not be independent. It doesn't work. That's the illusion.
The delusion is the constant irrational hatred for modern society. Just because you dislike blind consumerism doesn't mean you have to live in a cave. Like everything, modern industrialized society has many, many benefits that don't harm anyone.
These are just stupid extremists who can only think in black and white.