Safety in Japan

JapanThis summer, I am going to Guam, but many people said to me to be careful for the security.  While I said to them I’m OK, I became really nervous about it.  At the same time, I thought how safely I have lived in Japan.  Even in the city, I can walk at midnight alone. And in the countryside like Okinawa where my grandmother lives, surprisingly she never locked the door of her house.  It might be the personality of Okinawa’s people which is careless about crimes, but it shows how easy and comfortable to live in Japan.  I have heard from my friend that foreigners are surprised by the vending machines on the street.  According to the site, Japan is ranked in 5th for the most safest country in 2013.   I would like to live in Japan after retirement.