What does the title An Attractive Naivety mean?

It evokes the hopeful innocence of early twentieth-century Australia—an emerging nation confident in its destiny but unaware of the hostility and brutality of the empires that she would have to contend with. It was coined by Tatsuo Kawai, the Japanese plenipotentiary to Australia at the outbreak of war. Kawai had a soft spot for the Australians whom he regarded were honest and open-minded.

See Chapter 10 of An Attractive Naivety