He has no idea of History and the reason Japan relies on the US for defence - ignorance is not always bliss.
Japan’s current constitution was written in 1947 under the auspices of the American forces deployed to occupy and rebuild Japan after World War II. The new constitution celebrated goals of peace and democracy; as John W. Dower says in his Pulitzer Prize-winning book on postwar Japan, Embracing Defeat , the document was the “crown jewel of the [American] reformist agenda.”
Article Nine explicitly forbade Japan from maintaining a military or from using force internationally for any reason. It permitted only a narrow self-defense operation, which was founded in 1954 as the SDF. Dower argues that fatigue and disillusionment with wartime nationalism made the Japanese readily willing to accept this doctrine. Much in agreement with General Douglas MacArthur, the leader of the American forces in Japan, they envisioned a “Switzerland of the Far East”—a nation that would make its way by finance, not force.