mass behavior is rarely as rational as individual behavior
There is a ~small percent of people with European ancestry (mainly N Europe) with varying "immunity" to AIDS. The AIDS virus is apparently similar to the Plague in how it attacks cells, so the Plague wipes out the defenseless leaving behind people with some immunity for other viruses like AIDS. Thats what I read maybe a couple years ago anyway, not sure what they've concluded since. I doubt this is climate related

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