Actually herd immunity works quite well, that's what keeps the anti vaxxer's kids from getting measles, etc. You just have to get the herd immunized first

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"I remember South Africa in the late 70's, sleeping on the beach at J-bay, smoking ganja with the blacks. On weekends we'd go to the pub in East London to drink beer and fight with the Afrikaners. They liked to fight, I liked to fight. It was a good time"