"Fixed fortresses are a monument to the stupidity of man." - Gen GS Patton.
Nothing wrong with prepping, but there is a point where you WILL be forced by some circumstance to vacate your permanent dwelling. For the suburbanites that are stockpiling years of food, you better have a bug out plan! History does not support the bug in plan... refugees are the norm in any conflict.
"They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." - Ben Franklin.
"Extraordinary claims require extraordinary evidence." - Carl Sagan