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Originally posted by Vodstok
They never actually say in the movies, they just throw out theories. i think they left it up in the air on purpose. The mystery makes it creepier. Fear of the unkown and all that.
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Plus, it'd seem kinda forced if they actually found the reason they came back. If all they have is theories it makes it seem more...well, a movie about zombies isn't going to be realistic, but them only having theories adds at least some realism to it.