If one scrolls down to read what he has to say about the Native-American genocide the author works to deny blame and deflect for settlers that weaponized disease:
It is broadly true though, but also true that not all disease outbreaks are equal.
Bundling loosely related stuff together to make a nice narrative coherence where they can be considered single “events” for the purpose of making nice lists is arbitrary. We never include the 100 million Spanish Flu deaths in WW1 stats and there is no real logic to this compared to other events where we do add in the disease deaths that occurred roughly concurrently.
The idea of lumping together a 400 years process with multiple actors acting in diverse and often competing ways, along with many wars, atrocities, and conflicts and also epidemics of multiple diseases that were primarily just normal epidemics and considering it a single “event” is not really meaningful imo.
Someone dying of disease on a forced march across country is very different from someone dying during a natural smallpox or cholera outbreak.
We could put the formation of modern Europe into a period from the 30 Years War through the Wars of Spanish and Austrian Succession and the Napoleonic Wars and into the 2 World Wars and call it the European Wars. Add in some plagues, famines and natural disasters and decide it is the worst atrocity in history with 200-300 million deaths.
But we don’t, because we don’t see this as a single “event” even though it makes about as much sense as treating “The conquest of the Americas” as a single event. As a result we can treat it with nuance rather than trying to force it into a single, named atrocity.
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