Japanese people are pretty cool in general. Very cordial and polite, but of course it's a façade. Behind closed doors they whisper about other Asians being inferior, just like white people keep their racist remarks private. It's in their blood, they can't help it. I respectfully disagree with wholegrain, that right wing Japan has an agenda to replace U.S. as the military superpower of asia. They know how rash and reckless Red China could be, so they need WMD for deterrence. They know they will not catch China sleeping w/ pants down again for a long time. They are not stupid. They just don't trust the US policing the region alone.
Also, resources are scarce, so they fight for every little pieces. but to china diayudao (senkuku) is a matter of national pride and reminiscence of imperial japan, which boils the blood of every Chinese. I think both countries have a point, but they are on different pages and hold different priorities.
But, it's not something worth plunging the entire region into chaos. Both countries should tone down the rhetoric. the point is, no need to rearm if both countries would chill out, step back, and reassess.