1 guy is not an army but if some foreigner is ready to give his life and fight for your country that comes to prove a point that maybe you should expect more support than you have been expecting, that more people who are not Japanese than you've expected wouldn't like to see Japan invaded and would like it to remain an independent and free country.
Of course I can only speak for myself and do with my life what I think is right but my opinion is that Japan would receive a lot more support (coming in different forms) in case a theoretical invasion becomes reality.
Anyways, people value their lives differently, and that may sound funny but I for once feel ready to do everything I can to help keep Japan as is, should its independence is under threat. Here is not the place to discuss this in detail and give reasons and defend this position, it's just how I feel about all this.
haha exactly! :D