For a natural disaster like a tornado or other such event and you live in an area that this occurs, I think you would be crazy not to have one. Especially if you live in a trailer, which it seems like a trailer park always, gets hit when there is a tornado. As for use during economic collapse or total social break down, I can see a very valid point in having one but when in history has it worked out well for a person? Saddam, Hitler, ect? I don’t like the idea of not being able to see my enemies approach, fight back, and be mobile. If you fall back into a bunker in a WSHTF situation, whom are you going to call to help? Panic rooms work, and I have one for the family because they can retreat to it and call the closest authorities and me from the safety of a barricaded room. In a bad situation, no one is coming and the bad people can dump something heavy on the door and leave you there.