WWII

how come ppl don't know about what happened in China in WWII? i.e. how the Japanese invaded china and raped, maimed, tortured, beheaved, and killed so many chinese people?

Numbers:
Nazi's killed about 4.9million Polish and Jewish people.
Japanese killed about 10.2million Chinese people.
In total, 20 million Chinese people were killed in WWII, 16.2 million of which were civilians.
the ONLY country that tops that number is in the Soviet Union, with 23.6 million total deaths, and 11.9 million civilian deaths (altho they took a much harder hit cuz it was 13.44% of their population).
Third place: Germany with 7.5 million total deaths, but only 1.8 million were civilian.
(Sources: http://en.wikipedia.org/wiki/World_War_II_casualties and http://en.wikipedia.org/wiki/Japanese_war_crimes#Mass_killings)

So i don't understand how that's never had any popular coverage. not in china, not anywhere. Chinese people need to stick together more.