The best country/place in the world to live in

You hear so many times in public and in private individuals say "my country is the best one in the world to live in." How can an individual who has not lived anywhere else say such a thing? I can understand saying "I prefer to live here (or there)" for one reason or another, but "the best in the world?" What makes us want to utter such nonsense?

I believe we simply want to feel good about the choices we make.