WWII's plenticide was against compassion as well as the right of all to exist

It is well known that WWII was a deadly assault against the plenitude of the many different human ethnicities and classes.

Nazis and Communists and Japanese militarists all acted as if the human gene pool was a fetid swamp , better off drained of all Jews, Romas, Polish intellectuals ,Russian Kulaks, Chinese peasants and the handicapped.

They argued that at an abstract level, mainstream Science supported their interest in a program of active genetic pruning - and they weren't really wrong.