A group with relative immunity was exposed to a group with none. As a result, thousands of the immune-absent group died. The same thing happened to Europeans when traders brought the Plague back from the Far East.
It's what happens with multiculturalism. Kinda like how people in sanctuary cities are now being exposed to typhoid, tuberculosis, and smallpox.
“Christopher Columbus had no idea what caused measles.”
They make it sound like coordinated biological warfare.
Exactly.