The film is based on a novel (though it borrows almost nothing from it, as I understand it). The novel looks at global socio-politics through the lens of individual recollections of how governments and nations dealt with the zombie outbreak. I suppose it's a look at global political schemes via the storytelling device of a potentially-reversible apocalyptic event.
"Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts don't go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's in this century, but apples didn't suspend themselves in midair, pending the outcome. And humans evolved from ape- like ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered."
-Stephen Jay Gould
-Stephen Jay Gould
