The Dutch helped put down a Christian uprising in the island nation to help protect their status. In effect, they betrayed those who should have been their brothers and sisters in Christ. Granted, being Christians, those Japanese should not have uprose, but that is beside the point.
Dutch medical science was also used by Japanese doctors during their relative self-imposed isolation from the Western world.
Apparently, the experience of the Dutch in what was then the Dutch East Indies, helped reduce the mortality rate, particularly as to amputations among the POWs. Among the other allies, there was a mortality rate of about 50% for amputations. The almost total absence of medicine made it worse. I hadn't heard the story about the Dutch in Japan. Trade with Japan was obviously a higher priority than spreading the gospel of Jesus Christ.