The british genocide of native americans in North America.
The british genocide of aboriginal australians.
The british genocide of africans.
The british genocide of indians.
The spanish genocide of native americans in North America, Central America, Carribean and South America.
The portuguese genocide of native americans in brazil.
The german genocide of namibians.
The german genocide of jews.
The german genocide of soviets.
The japanese genocide of chinese.
The japanese genocide of other asians.
The ottoman genocide of North Africans.
The belgian genocide of the congolese.
The hutu genocide of the tutsis .
FYI
The roman empire killed far more people in history but its not castigated. It killed many european tribes and also those in N Africa.
Genghis Khan killed more people that there was a drop in the emission of CO2 in the world but he is not castigated.