Why only a few days? Why does it even bother you that some people prepare for emergencies? Millions of us have lived in conditions where 2 weeks has been revealed as the minimum for preparedness. Many need tornado proof shelters and what is the reasonable limit for buying ammo to you?
Those who live in tornado country or hurricane country may well have good reason to prepare for tough times.If that means a week or two (or maybe even three) of food,water,etc it may be wise and reasonable.It's the ones who have gas masks,food supplies that have a 20 year shelf life,1,000 doses of penicillin and 50,000 rounds of ammo who are the whackjobs.