system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Okay, I know fighting zombies is kind of a fun concept. But how to explain the incessant rash of zombie-related EVERYTHING that struck America in the past few years?

Seriously. Without looking anything up, I came up with Shaun of the Dead, 28 Days Later, 28 Weeks Later, Romero's Dawn of the Dead, Romero's Land of the Dead, Zombieland, Resident Evil 1-5, publication of the popular Zombie Survival Guide, The Walking Dead graphic novels and now TV series... 

What the undead fuck. Sure, it's cool to think about. But what's our culture's fascination with taking one type of supernatural being (be it aliens, vampires, zombies, whatever) and just running it into the ground?
gpt
The cycle tends to go like this, something is obscure and underground.  At some point, something comes along to bring at least a part of it out into the light, media companies see an easy way to make a buck.  They make it overly romantic, in the literary sense, so that it's easier for a larger audience to digest, people get burnt out, eventually it goes back to being more underground.  It happened with wizards, vampires, were-wolfs,  the supernatural, it all follows the same path.

There is, however, another part to the zombie apocalypse in that certain people use it to live out a heroic alter ego in which they are a survivor and will make it through.  The humble and meek are transformed into heros and alpha-males overnight.  Try to think of the main demo this stuff is aimed at and you'll find your answer.