A lot of people don't have the money or time to create a SHTF safe place fully stocked.
And, at 73, I doubt that my wife and I could survive the rigors of a SHTF scenario. My plan is to stay put and try to survive with 3 to 6 months of food. Most people, by the end of the 2nd month, will have died from starvation or drinking contaminated water. The rest would "living" on meager rations in FEMA camps and doing make-work to keep them too busy and tired to make trouble. I doubt a government run "help" center would waste resources on my wife or I.
The hard thing to do is to avoid being "rounded up" when the military sweeps through and demands everyone leave their home and be transmitted to an unfamiliar place, while folks from other places are moved in where I live. The purpose, of course, is to keep people unfamiliar with the area they are in.