Well, I'm Chinese, and from my view point, the younger generation tends to lean more to Japanese, while the older generation absolutely detest them (with what the NanKing massacre, WWII, what do you expect?).
Towards American culture, well, I'm not sure; i grew up in Canada, so it's always been there, no hype about it.
As for 'stop living in the past', well it's sort of hard, isn't it? My grandmother lived through the time when the Japanese came to Taiwan; she learned how to fire a gun and throw grenades from those times. My father, who grew up after the Japanese left, knows the hardship of what the country was going through.
Three generations later, the younger generation, namely, students my age, still know of their cruelty through our older family members. Perhaps we will move on when time moves on, and washes away all that blood still remains today.
NOTE: I didn't read the entire thread..