To me, about the only interesting aspect of the latest zombie film, World War Z, is how it dealt with a certain notion that it shares with all post-apocalyptic narratives, namely that the politics we (many liberals and leftists, at least) find iniquitous in the real world might find a moral purchase in the dystopian fantasy. (The film itself is arranged like a video game, where Brad Pitt goes from scenario to scenario, completing each mission, only to be told by the Side Character Who Knows that the possible solution lies at the end of another mission set in another context with its own set of possible actions.) That actions can produce different moral outcomes depending on context shouldn't be all that surprising, though, since most everyone is surely familiar with the adage about how even the most heinous of political systems might at least keep the trains running on time. That is, if you simplify the public good enough, like the purpose a junkie finds in addiction, one can find an advantage to any system. In the context of a zombie apocalypse, the desideratum is, of course, surviving one more day from the undead plague.
So, one thing a totalitarian regime like North Korea is ably suited for is to marshall all of its forces into closing off its borders and making sure none of its citizens is able to spread the disease should he or she become infected. Ideally, the advantage to martial law is to circumvent time-consuming debate during an emergency. This automatically gives an advantage to a totalitarian regime over a democracy, since only the latter has to bother calling for martial law, the former having already been operating under a military state preceding the emergency. Likewise, because North Korea recognizes no inalienable rights to selfhood, current Supreme Leader Kim Jong-un can put his state apparatus to efficient use by removing all the teeth from his entire citizenry. Not that infection was all that probable, since the country was living in a bubble at the time of the outbreak.