Frankly, Zombies are reminiscent of the teeming hordes of seemingly mindless people that exist beyond our more personal, simpler worlds.
Using rampant consumerism and self interest motivated anonymous bodies to describe the greater world in an attempt to make sense of it all seems to me an apt analogy.
Competition for resources, and the ultimate desire for self preservation and eventually prosperity, along with the exponentially increasing population, blur the lines separating fiction from actuality.
So, come along with me, grab a zombie by the hand,
and shoot 'em in the head.