Well, take a look around your area: Where are the chain link fences topped by razor wire. Seriously. How many and where are they? How many dead end alleys are on your escape route? How long will it take the human predators, dog pack, and rising flaming flood waters to get to you, versus cutting your way through the chain link fence topped by razor wire.

I was raised on a farm, and I never saw a barbed wire fence people couldn't get through without damage quicker than they could have cut through. Farmers weren't running concertina razor wire back then, but things may have changed and things may be different in your neck of the woods.

Without knowing where you are, your imagination does seem to be running rampant. None of what you describe happened in New Orleans as far as I can recall. Did I miss something on the news?

On the other hand, just grab the bolt cutters and put 'em in your BOB. If you're that concerned, just get them.