Flash, I think it's important to point out that it's not just this whacko that thinks things like the Rape of Nanking and other attrocities the Japanese committed during WWII never happened. I've seen their textbooks, and there's virtually nothing in there about those things. It's a very, very hot point between Japan and China, Korea, and other countries litterally and figuratively raped by Japan during those years. It's a function of Japanese mentality and mannerisms that has caused what really happened to be left out of their schoolbooks: "What happened was unpleasant and embarassing to us, therefore, we will not speak of it." That sentiment is encountered/expressed on any number of different levels and on a daily basis in Japan. If someone gets tanked and tells off the boss, well, he was drunk, it was unpleasant, so we'll just not talk about it and everything will be OK. Now, I am by no means defending this guy (I have also read/heard of the gentleman in question before), but it's important to realize two things: 1. Why he is as crazy as he is; 2. He is definitely not the only person in Japan who actually believes none of that stuff happened.
The Japanese made innumerable, vengeful enemies during their imperialist days, whether they'll admit it or not. With their constitution in its current form (Article 9), who is going to stave off China or even South Korea when they decide to get some payback? I have many friends serving in th JSDF, and they're incredible people, but they're forces are small, underfunded, and generally train more to peace keeping/humanitarian/support type missions, vice open conflict. (Except for the JMSDF 'Frogmen', who aside from having some very hot women in their ranks, are hardcore, modern-day ninja assassins with automatic weapons.) The point is, if this guy doesn't think that the US can stand up to China, who's going to keep Japan safe? Sure, economic and political containment is all well and good, but the Chinese haven't exactly displayed logic in the decisions they've made in the past. Granted, it was in another timeframe, but it wasn't so long ago that how many tens of millions of Chinese citizens fell victim to the Great Leap Forward/Famine and the Cultural Revolution? If they'll let so many of their own people die, what are they willing to 'let' happen to Japan, which they hate with a passion?