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The world is our family
oth natural selection and the historical record offer powerful reasons for doubting the trustworthiness of our naive moral intuitions. So the possibility that human civilisation might be founded upon some monstrous evil should be taken seriously - even if the possibility seems transparently absurd at the time.
One of the reasons marijuana is illegal today is because cotton growers in the 1930s lobbied against hemp farmers they saw it as competition. 