The "sub culture" you're referring to is just ordinary people that just use common sense and prepare for leaner times IMO. No matter what the circumstances are.
That's something my grand daddy taught me >50 years ago,,,,just like his did, before that
so I guess then my family have been "prepper's" for >400-500 years and well before the word was stylish,,,,,and the whites were even here. It's just a new name for good old common sense practices that have been around for centurys.