When I was younger, watching post apocalyptic shows and movies made me think/fantasize what I would do to survive in such situations (and usually rate myself pretty well in being able to survive).
Now, I'm much more "F** that S**" and would take a quick painless death over long drawn out misery.
Those movies were lying to make a point; they were trying to terrify people and succeeded, not trying to make them survive if it actually happened. It's rare that you would see a thoughtful film about surviving and rebuilding the world after it, because it is beyond the scope of film and doesn't have the hook that fear brings.
Don't take things too seriously. Remember all the movies about the internet in the 1990s.
Now, I'm much more "F** that S**" and would take a quick painless death over long drawn out misery.