People do know about the massive killing of the Chinese done by the Japanese during the second world war, but it doesn't seem like enough people know about it. Not too many people talk about it for some reason. Depending on who you ask roughly 50,000-300,000 died during this raid and it even still effects relations between China and Japan today. So why doesn't get attention?
Look here http://www.ww2f.com/topic/57504-the-nanjing-massacre/?hl=%2Bnanking+%2Bmassacre http://www.ww2f.com/topic/56772-japanese-atrocities-in-ww2/?hl=%2Bnanking+%2Bmassacre#entry639649 http://www.ww2f.com/topic/51508-site-for-the-rape-of-nanjing-maybe-too-much-for-some/?hl=%2Bnanking+%2Bmassacre
I certainly wouldn't refer to it as a "raid". The massacre took place to a large extent after Japan had gained pretty much full control of the city and they didn't leave any time soon. I would guess that more people than you might think are aware of it but there aren't the controversies to keep it in the spot light or to generate much in the way of debate.
My fault, I didn't word my question in the best way. What I meant was why don't more people in history classes and such talk more about the massacre.
I took this photo from this website: http://www.globalresearch.ca/grassroots-fascism-the-war-experience-of-the-japanese-people/5473513
They're all Chinese http://www.shutterstock.com/pic-242821915/stock-photo-two-chinese-men-kneeling-prior-to-execution-by-chinese-soldiers-the-sino-japanese-war.html
The link to the photo is here: http://www.abc.net.au/news/2015-08-11/japan-wwii-massacre-survivor-apology/6689610
It doesn't fit the narrative most people care about. If you're European, that theater is the primary one and the Pacific theater was just a small skirmish off in the sticks. If you're American, the war started when the Japanese attacked Pearl Harbor. I'm speaking in very broad terms, of course.
Doesn't get any attention? What? You think the world should still wallow in this singular disaster of 80 years ago? Like there hasn't been any other massacres or disasters in the interim? The 228 "incident" in Taiwan, the Jeju uprising, the genocides in Rwanda, Sudan, Ethnic cleansing in Bosnia, the Anti-Sikh riots, ... I could go on for weeks. Or maybe you just haven't been paying attention. Here is a list of some of the articles one news site has had that refer to the Nanjing Massacre. How much more should they have?
I don't think that the Rape of Nanking is even taught in Japanese history classes. In fact. I've read that Japanese school children are taught that the US started the Pacific War by crippling the peace loving Japanese and the benevolent Greater East Asia Co-Prosperity Sphere by enacting dastardly trade sanctions.