Everything in your post was ok until the last word -- squirrels.
Squirrels are readily availabe, easy to harvest, and delicious. Same for rabbits. If you can kill 1 squirrel a day or 1 rabbit every othe day you can survive forever. Often while out squirrel or rabbit hunting the guys I'm hunting with and myself will skin out one or two of them and have them for lunch on the spot.
I don't camp out anymore but when I used to, I'd take 3 tins of sardines, 3 tins of potted meat, and a handful of Slim-Jim pepperoni (sp?) sticks no matter how long I was going to be gone. That way I always had enough to eat for at least 6-days no matter what came up.
I do think some guys over plan for the what if the SHTF scenario but Hey!!!!, that's their gig and if it makes them happy .............. . Me. In the old days, I'd go out and practice woodsmanship but at the end of the day, I climb into a nice snug sleeping bag in a nice tent so as to rest up for more practice the next day.