Drug addiction was obviously a convenient way to make the slaves forget their aches and fears, to keep them everlasting anxious to please whatever was necessary to make sure the precious, deadly ration never stopped.
Drugs were too rare for slaves to get a hold of.
mnli hypothesis: Drugs were too rare for slaves to get a hold of. premise: Drug addiction was obviously a convenient way to make the slaves forget their aches and fears, to keep them everlasting anxious to please whatever was necessary to make sure the precious, deadly ration never stopped.