Zombie films are considered to be a form of social commentary. So why not Die Hard? Would you drop that fucker Lars off of the building? Would you let go? Was it right for the good cop to be the bad cop that kicks a lot of ass?
The original Night of the Living Dead is about point of view. And while it's a violent movie with flesh eating humans, you can either board up the house, hide in the attic, or hide in the basement. Your choice. So really, the movie is more about the way of human thinking, and not zombies.