population density

[Tartar Horde]

I find it impossible to discuss topics with so many variables. We can prepare for any situation we feel may affect us to the best of our ability, but in any real SHTF scenario the situation will change very rapidly and I doubt anyone's plans will survive first contact. It is good to theorise and play out such episodes, but don't think the World will unfold to your survival scenario because it won't. Our greatest tool to surviving is adaptability.
The only constant in the Universe is change, adapt or die.