Points that I see different are:

- there're terrorists, they have attacked the US and might try to attack again. Police is the 1st line of defense.

- Both Japan and NZ are island s. Border control is easier to some extent. There criminals crossing borders with drugs and other illegal stuff - and illegal immigrants as well.

- Social differences: hundreds of billionaires, billions of poor people.

- Race differences: people from every part of the world wants to live there. So there's a considerable number of Latins, Asians, Middle East, Africans, plus the racial issues with afro descents. It's not easy to provide security to all those differences, each has their own culture.