Fast food is often the only restaurant option for people working night shifts. I used to clock out at 5am. You know what's open at 5am, when you're hungry but too tired to cook dinner because you've been on your feet for ten hours? Fast food. Maybe a diner if you're near a truck route, but honestly that's not much different.
It's far from the only way society ignores the needs of people who keep everything running behind the scenes, but it sure was annoying.