I support gun control and everything, but how do you know that the low homicide rate is because of the gun control? Japan has been a model for social order (putting aside organized crime, in the sense that you lose your wallet and it gets returned to you, muggings don't happen often, etc.) for a long time.
I don't know that the homicide rate is because of gun control. I don't think it is possible to directly come to that conclusion given the other societal factors.
But it's an interesting data point.
This article tries to dissuade that control gun is responsible for the low homicide rate in it's summary.
"The idea that Japanese gun laws should serve as model for other nations is not uncommon. Some Americans propose laws even more severe than Japan's.[124] Often, the suggestion comes as an offhand remark in an newspaper editorial, but even when the suggestion is advanced by scholars, the reasoning is often superficial and unpersuasive.
L Craig Parker, an American expert on the Japanese police, proposes that the United States adopt Japanese gun control and also other Japanese strategies, such as a National Police Agency. Parker's brief discussion of guns, however, simply recites statistics showing that Japan has less guns and less gun crime. His only evidence that gun control would actually reduce crime in America is a study by Dr Leonard Berkowitz arguing that guns cause aggression. Actually, what the studies by Berkowitz and others showed was that people acted more aggressively towards other people if the other person was associated with weapons; for example, motorists reacted more aggressively to other vehicles slow to accelerate when a red light turned green if the slow car had a rude bumper sticker and a rifle in a gun rack.[125]
Summing up the perspective of many gun prohibitionists, one Japanese newspaper reporter writes, 'It strikes me as clear that there is a distinct correlation between gun control laws and the rate of violent crime. The fewer the guns, the less the violence'.[126] But the claim that fewer guns correlates with less violence is plainly wrong. America experienced falling crime and homicide rates in the 1940s, 1950s, and early 1980s, all periods during which per capita gun (p.40)ownership, especially handgun ownership, rose.[127] And Japan, with its severe gun control, suffers no less murder than Switzerland, one of the most gun-intensive societies on earth.[128]
Japan's gun control does play an important role in the low Japanese crime rate, but not because of some simple relation between gun density and crime. Japan's gun control is one inseparable part of a vast mosaic of social control. Gun control underscores the pervasive cultural theme that the individual is subordinate to society and to the Government. The same theme is reflected in the absence of protection against Government searches and prosecutions. The police are the most powerful on earth, partly because of the lack of legal constraints and particularly because of their social authority."
