Sure, but leaving the area means abandoning a place of shelter, community, and potentially a decent chunk of supplies. I agree, plenty of disasters wouldn't warrant use of firearms, but having them and not needing them is considerably better than needing them and not having them. Seems like one is strictly better than the other. I suppose possession of unnecessary firarms could risk having them stolen or otherwise ending up in the hands of people doing harm - but seeing as 30-40% of US households possess firearms, this is a moot point.