Again, not to keep a circular argument going, but I am just not sure how stupid it is.
I have never heard of nuclear war or alien invasion affecting dive planning. But I most certainly have heard of people running out of gas. Should it happen with proper planning? No. Should any accident (dive, car, surgical or any other) happen if you have proper planning? No. Do accidents somehow happen anyway? Yes. Ergo sum, it is worth thinking about how to deal with it.
I have never heard of nuclear war or alien invasion affecting dive planning. But I most certainly have heard of people running out of gas. Should it happen with proper planning? No. Should any accident (dive, car, surgical or any other) happen if you have proper planning? No. Do accidents somehow happen anyway? Yes. Ergo sum, it is worth thinking about how to deal with it.