I forgot in what context my post was moved here, but it is not about a matter to scare or be scared.
It is true as 4321go said above that there are so many hypocrite countries exporting much more arms than the two countries. And even after the great two or three (China, South Korea and you can include the DPRK) Asian nations quit exporting them, others would be pleased to export instability to other poorer countries.
Japan is the country where...
higher personnel cost as H. Nagashima said,
a trading company who imports the expensive arms from the US was highly bashed for its ambiguous profit,
more transparent government spending (its cost/benefit is another issue, though),
and stricter arms export control as you may not hear of any Sony super machine guns, Toyota super tanks or Nintendo Super Mario missile outside Japan.