The US gov (see: https://www.ready.gov/pandemic https://www.ready.gov/pandemic and https://cchealth.org/pandemic-flu/pdf/individuals_and_families_checklist.pdf

The US gov (see: https://www.ready.gov/pandemic https://www.ready.gov/pandemic and https://cchealth.org/pandemic-flu/pdf/individuals_and_families_checklist.pdf https://cchealth.org/pandemic-flu/pdf/individuals_and_famili...) frequently tell you to stockpile some amount. The point of this stockpile isn't to deal with total long-term breakdown. They're not telling you to get 2 weeks supply because they think there will be no food available for 2 weeks. They're telling you to build up a supply to help ease the very supply distribution activities that you're saying will happen. The more supply buffers that exist in individual households, the more easily authorities and organize and distribute supply. But you're right, it's not the end of the world.