Of course, the “brave embattled survivors fighting hordes of mindless consumers” is not at all what happens in reality, even when you remove #zombies from the picture.
We know that in times of disaster/war, people band together, help each other, share their supplies. It’s BECAUSE they’re not monsters - the overwhelming majority of people feel empathy, have a sense of community, and feel the pain of others suffering. People WANT to help, and in disasters, they DO HELP.