Greg Boyington (Col. Gregory Boyington, USMC, ret. . . deceased), said he was never mistreated badly by the Japanese guards who could speak English. It was the illiterate and the ignorant who were brutal. That's interesting but not surprising. Eric Hoffer once wrote, "The unintelligent are often frustrated with their own shallowness, therefore they lash out at others."
Boyington, famous for the Marine Black Sheep squadron he commanded in the Pacific in World War Two, was shot down and taken prisoner by the Japanese near the island of New Britain in the South Pacific.