Having worked for the Army for 27 years in a number of different failed countries I may have a unique perspective on survival that I would like to share with your readers. I believe most of the "survivalist community" is vastly underestimating the impact that other humans are going to have on their plans. Hunkering down and waiting for everyone to die off is a simplistic plan and I believe has almost no chance of working. You may be able to hide your retreat, but you can't hide the land it sits on. That land itself may become a scarce commodity if the US transitions to an agrarian economy.
Food is the key resource. Most communities are at risk because they simply don't have enough calories stored to get them through any kind of crisis. But, storage is no more than limited capital to allow people time to grow more food. Food production requires land....if your retreat is sitting on farmable land, it will be a scarce resource.
Carrying capacity of the US using non-petroleum farming techniques is far lower than most of your readers probably think. Also, most areas of the US, especially cities, don't have anywhere near enough farm-able land to go back to some kind of agrarian pattern. Without public infrastructure and modern transportation, we are going to experience a huge die-off caused mostly by starvation. In a total collapse scenario without immediate restoration of the economy, basically everyone who lives in a city is doomed unless they can take over some kind of farm land.
Go read the whole thing.