The context is talking about whether we should regulate the environment or just normative ethics; Tokyo has a lot of laws regulating the environment.
I don't know if you're pretending to be unaware or genuinely ignorant, but no. Japanese society places extreme emphasis on teaching children to behave respectfully in society and these values are taught from early childhood to adulthood. If you want to attribute their low crime rate to gun control you'll have to bring something halfway convincing to the table.