>What does this look like to you?
Ancient (or not) walled fortress. Notice the secondary and supporting walls running down the ridge behind it and surrounding the right side in this view.
>are most people in here preppers?
I'd bet most of us over 35 and almost all the vets, farmers, ranchers, hunters, fisherman, loggers, construction guys, cops, fire, first responders.
In a word, yes.