The idea of a zombie apocalypse is pretty absurd when you really think about it

And not because zombies aren't real, duh. But if they were real, they wouldn't be real for terribly long. If we're talking the typical zombies who infect others by biting them, then any outbreak would be quelled immediately with an armed response. Sure a post-apocalyptic setting caused by zombies makes for good fiction, but short of civilization just letting the outbreak become a pandemic, it doesn't make a whole lot of sense.