Japanese culture is different, you're stuck in the US with blinkers and no knowledge of other countries. The Japanese are brought up to respect their country and people, if they fail, say in business, they feel they've let their country down and thus commit suicide. So if you want any comparison between the US and Japan for suicides, you're an idiot.
Secondly, you gun nuts bash on, idiotically, that you need guns for self defence, but in the same breath, claim most gun deaths/incidents is suicide. So you've just undermined your own argument that you need guns for self defence. Self defence is just a guise, nothing more and nothing less, and you just backed that up.