And some bad guys will shoot you out of hand as soon as they get the drop on you.
A survival axiom is "two is one, one is none". Try to have a backup sidearm and try REAL hard not to get ambushed. If you have to evacuate back home, you had probably better cultivate a functional paranoia until you're safely home.
The one time I read about a situation close to what you're envisioning, two families were evacuating ahead of Hurricane Katrina. They had extra fuel and water in the back of a pickup and the two men had to display their handguns to avoid having their extra fuel and water "liberated" by folks who hadn't prepared as well.
This will be more the norm than most folks want to believe. Desperation will drive people to do what ever it takes to survive. Katrina was and isolated (Confined to on geographical area) that stood to have assistance from outside resources. The stories that have emerged from that are a bit frightening. If there where to be a national or global event, well, you ain't seen nothing yet folks.