LOL... that was going to be my question... "What more needs to happen to qualify..."
I think there are numerous differences that all play a part, but the role of family in Japanese culture I believe is the most critical. The Japanese are much more family-centric (and thus more community-centric as well). Here in America we've not only had a disintegration of the family-unit but even before that we fractured as a community. Japanese are much more likely to think "what if that shop were owned by my father?" than people here - but it's even more basic than that. The more likely thought is "that shop is owned by someone's father - so I wouldn't dream of doing anything to it that I wouldn't to my own father's shop"... Americans are more likely (even in strong families) to see it as "us against them" - and basically only show real solidarity when faced with an outside threat.
However, a large part of that mindset is the price of true freedom - we have a culture where no one is 'wrong' no matter what they say or stand for. While there are some truly great advantages to operating this way (i.e. scientific, technological, political, artistic freedoms and advances) - it by definition also makes it OK for someone to be a complete @$$hole and spew hatred and bigotry. There is a reason that Japan (and to a great extent many asian cultures/countries - especially China and Korea) excel at manufacturing - but for much the same reason, there are very few truly unique innovations that come from there.
We have many more 'mavericks' here - both good and bad ones - and a culture that rewards those that
stand out from the rest. They have a culture that for all intents and purposes rewards those that
do not (i.e. those that draw absolutely no attention to themselves whatsoever). Although it's easy to criticize the agressive, mouth-breathing, looting/raping morons we've witnessed in recent catastrophes here... America would also never have become one of the most powerful and wealthy (both in resources and in knowledge) nations this planet has seen in under 250 years. In terms of human history... that's like 5 minutes. Of course, we're working hard to destroy all of that good fortune in even less time... but that's a topic for a different vent.
In any case, I think we can all agree that the people of Japan not only deserve our assistance in every way possible during this time - but our respect and admiration as well. If only we could find a way to embody the best example of both of our cultures while supressing the bad... we could truly make the world a better place for all.