Steven Pinker credited White with creating "the most comprehensive, disinterested and statistically nuanced estimates available", and praised the methodological standards of White and the transparency of sources; however, Pinker said that numbers provided by White are "at the high end of the range".
Charles S. Maier, a professor at Harvard University, stated that "these figures are notoriously elusive" and that White "seems to have tried to get the best figures he could". He wrote that most historians feel ashamed about doing this kind of raw exercise, adding that "here's a guy who hasn't been afraid to get his hands dirty".
Ben Kiernan, director of the Genocide Studies Program at
Yale University commented that "averaging guesses alongside more precise counts can be misleading". Randolph Roth, co-director of the Historical Violence Database at
Ohio State University, said that it is difficult to make a quantitative analysis of an event while not knowing about the qualitative side of the context. He praised White's effort to look at the big picture, while adding that "it's going to be hard for many historians to read this book and look at that death toll for Genghis Khan, that 40 million, and not have a sinking feeling".
Rudolph Rummel, professor emeritus of political science at the
University of Hawaii, disagreed with White on the extent of
democide present in the 20th century. He called White's statistics "not reliable", and said that
Joseph Stalin killed 61 million people, rather than the 20 million mentioned in the book by White. He insisted that the difference in numbers is "a profound statement on the nature of Communism". ==Public reception==