Is this really true. AFAIK arab country has the most many suicide incident if suicide bombing will be counted. Hahaha. But seriously most of the people of japan has a unique behaviour which is they are full pride. Once they become a failure, they choose to suicide rather than to become a disgrace to his/her own family.
I don't think so, there are not enough suicide bombers to dent the Arab's rabbit-pace reproduction.
As for Japan, yes, it's called "saving face". It seem to be a major factor for actions in most Asian countries (even in my Philippines which feel more like Latin America). You unknowingly embarrass them, they'll try their best to avoid you. They do something they feel embarrassed themselves, they dwell on it. You probably see some of their disgraced politicians or CEO in the past commit suicide.