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Dmytry comments on Brain shrinkage in humans over past ~20 000 years - what did we lose? - Less Wrong Discussion
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Speculating is the key word.
In a harsh environment where humans barely survive, ritual cannibalism would stay just long enough until someone's protein mis-folded and the stupid practice got the well deserved handicap. You need some sort of tropical paradise isolated from competition to sustain Kuru-afflicted population for any time.
There are plenty of highly-competitive, agricultural civilizations in the tropics.