Top Three Most Lethal Atrocities

 This is excerpted from the book Better Angels of Our Nature by Steven Pinker.

In the Chapter "Long Peace," the author explains the historical myopia and the availability heuristic, which hinder a fair assessment of the current status of humankind in terms of violence.

There is a table on page 195 where 21 major atrocities executed throughout human history are listed. These events are ranked based on death toll adjusted for the 20th century:

• Number one is the An Lushan revolt (8th Century) in China during tang dynasty. The actual death toll of 36 million is equivalent to two-thirds of the empire's total population and one sixth of the total world population (~ 429 million in 2018).
• Number two: Mongol conquest (13th Century) with 40 million casualties (~ 278 million now).
• Number three: Mideast Slave Trade (7th-19th Centuries): 19 million casualties (~ 132 million now).