Look, for one............at the sheer number of genocides in the last century alone..........which was the 20th century............compare that to two,  how common there are across the globe............

The History Place - Genocide in the 20th Century

www.historyplace.com/worldhistory/genocide/

Adolf Hitler to his Army commanders, August 22, 1939: "Thus for the time being I have sent to the East only my 'Death's Head Units' with the orders to kill without ...

List of genocides by death toll - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/List_of_genocides_by_death_toll

Wikipedia

This list of genocides by death toll includes death toll estimates of all deaths that are either .... In 2011 the Polish Government passed a resolution for the official recognition of the 2nd of August as a day of commemoration of the genocide. ... of the Dzungars was "arguably the eighteenth century genocidepar excellence.".