I've heard the numbers in that book have been inflated (wether that's true or not I don't know for sure) and I'm not saying that state 'communism' wasn't very repressive and that it didn't kill many people. However . . .
Every year 8 million people die globally from a lack of clean water, 7.6 million die from hunger, 3 million die from curable diseases and 5 million die of malaria.
That's over 20 million people each year that die, not because their deaths are not preventable (they are), but because keeping these people alive is not 'profitable' under capitalism.
So capitalism kills atleast 20 million people per year globally. That's atleast 100 million deaths in just 5 years! So you can see how capitalism has killed way more people than authoritarian communism (which is infact a type of state capitalist dictatorship in practice).
Also in 2016, 15.6 million children under the age of five died, thats 15,000 a day (76.5% of them in Africa).
3.1 million children die from under-nutrition per year (hunger and under-nutrition contribute to half of all child deaths globally). Under-nutrition causes children to be more vulnerable from illness and can exacerbate diseases.
66 million primary school age children attend classes hungry around the developing world (23 million of whom are in Africa). Going to school hungry obviously affects their ability to learn.
These figures are from a number of organisations such as UNICEF, the WHO, The World Food Programme, Poverty.com and UN Water.
Mmm, I wonder why some people such as anarchists are pissed off at capitalism? (and I haven't even mentioned the global environmental harm caused by this evil system and it's demand for ever more year-on-year profit making)