I agree totally. I love modern Japanese culture but there lack of acknowleging or avoiding what they did to China is not right. But every country has its share of shame, including genicide, torture & invasion at some point. It does not make it right though.
Thats what I find so shocking about the cartoon. Of coarse the same can be said of South Park, but at least everyone is attacked.
They do stereo type Japan as well in it. The American does not know where the other countries are located on the map (so true), wants to be the hero & eat hamburgers, talking with his mouth full all time.
Whats funny about it is Germany one of the main characters and is only somewhat normal. The cartoon centers around the WWII Axis somewhat like a Marx brothers or a Three Stooges comedy. Only in Japan.....