Hi, it is interesting question. I think it is not quite true. There are people who make photos mainly of the people or street scenes and then the people can be of their own country - see photos by Takero - the people are Japanese. But I admit that when you are in a foreign country it is more natural that you make photos of people. If someone in my country asked me why I made photo of him/her, I wouldn't know what to answer.
On the other hand, for Western tourists Asian or African people seem much more interesting - they have exotic dresses, behave in quite different way.
And other thing - in TOS, the self-portrait, images of friends, family, neighbours are forbidden. More safe is to show people of other country.