I always assumed that somehow someone working there lost the knowledge or desire to do their job and so fail safes failed? I don't know, kind of like the methane gas guy in Preacher? All i could ever guess.
Though that's a terrifying idea. If you had zombies intelligent enough to train to do things like that. Which gets really frightening because then you're probably talking military experimentation for super soldier type things. Imagining that thin line between Captain America and zombie infiltrator? Kind of scary.
[At least to someone that has never lived in a zombie world.]
That's reassuring, though you have a point. Because then we know who we're looking for too. Though, in fairness, I think it's more someone following TV tropes than we're actually in a horror movie... except I'm suddenly realize with what has happened, I'm not sure there's a difference.
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Though that's a terrifying idea. If you had zombies intelligent enough to train to do things like that. Which gets really frightening because then you're probably talking military experimentation for super soldier type things. Imagining that thin line between Captain America and zombie infiltrator? Kind of scary.
[At least to someone that has never lived in a zombie world.]
That's reassuring, though you have a point. Because then we know who we're looking for too. Though, in fairness, I think it's more someone following TV tropes than we're actually in a horror movie... except I'm suddenly realize with what has happened, I'm not sure there's a difference.