Go back and read the news from after some recent natural diasters - winter storms, hurricanes, landslides. People can be suddenly cut off from supplies and even with an immediate response it could be a week or more until basic food and water is avaiable to everyone. Most stores in cities need daily or at least a couple times a week of deliveries to keep shelves stocked. Rural areas aren’t any better. None of them are set up to have every customer show up in the same 24 hour period to restock. Having a bunch of stuff on hand that doesn’t need refridgeration and can be eaten as is, not cooked, is very important.