I'm not so sure about the Aggressive Pacifism. From the Wikipedia article about the book -->
The book is also interesting historically as Butler points out in 1935 that the US is engaging in military war games in the Pacific that are bound to provoke the Japanese.
"The Japanese, a proud people, of course will be pleased beyond expression to see the United States fleet so close to Nippon's shores. Even as pleased as would be the residents of California were they to dimly discern through the morning mist, the Japanese fleet playing at war games off Los Angeles."