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Maybe he just thought the documentary was interesting and wanted to share it with us, because he loves us, and we love him
He failed to realize that western imageboard users are borderline retarded and can not appreciate the informative value of a documentary.
Or he's an evil mastermind and put that link up deliberately to piss off the angry hordes of autists who foam the very moment they see reddit mentioned (calling someone a redditor isn't the best derailing method without reason, after all).