Think over the past ten odd years the stories that pop up in the news about foreign students or foreign tourists caught trespassing or photographing critical sites in the US- dams, bridges, power generating facilities, nuclear sites.
And always, the stories read as if they are some confused rubes who are never detained, or arrested.
German bicycle clubs toured England in the 1930’s, taking lots of photographs everywhere they went. And yes, Japanese diplomats in Hawaii took cameras everywhere they went.