I am late to the thread but a similar question was asked a few months ago. My answer is the same. Also, I love zombies.
Because I am incredibly tired, here is the exact reply I put in the other question:
Stories of zombies are actually as old the human race. You can find them throughout recorded literature. However, the modern zombie has changed significantly. Most of what we see of zombies today are the result of George A. Romero’s Night of the Living Dead (1968). He used zombies as a way to criticize the many negative social standards present in the real world – such as slavery, bio-engineering, religion, exploitation, greed and government incompetence. He added post-apocalyptic themes to tempt our innate interest in human survival – how far one might go to merely survive in such a world.
The fact that zombies are usually reanimated humans is what makes it all the more interesting (however gruesome and terrifying it may be). They are usually depicted as creatures who do not feel pain and do not need to eat/drink to sustain themselves…who keeping coming back until their brains are destroyed/severed. One bite and you become one too. All these qualities make zombies terrifying in any form, let alone the human version. Those distinctions make them very different than aliens, vampires, demons, etc.
A post-apocalyptic zombie world forces us to face our own mortality. Mortality, in itself, is a topic that has interested us from the time we became cognitive beings.
There are many people pining for an apocalypse in any form… a new start for humanity – of course this depends on enough people surviving one. This aspect alone, peaks our curiosity.
As time moves forward, the possibility of something apocalyptic happening becomes that much more real. More people are thinking about it (maybe not the zombie aspect, but of something big enough to splinter society as a whole). There are many people, from all walks of life, preparing for disaster.
In short, the fascination of zombies can be seen as a reflection of (and reaction to) our own fears, curiosities and social unrest in the growing unreliability of the world around us.
This is the second time I’ve reposted this old response! Deja vu?