I suppose the US could have propped up some asshole to be a West-friendly dictator in Japan, a la the Shah in Iran. Even that probably wouldn’t be enough - Japan probably liberalizes in the 80s, same as ROK and Taiwan.
You want to piss off the Japanese, it starts with demanding a truly unconditional surrender - OTL the Japanese asked to have their emperor protected from prosecution for war crimes. If Truman and Co. tell Japan to go fuck itself and prosecuted the emperor anyway, disbands the royal family, and props up a West-friendly asshole to rule the ROJ with an iron fist, expect Hirohito to become something of a resistance figure even in death. The message the Japanese will get is “they leveled our cities, unleashed the fires of hell itself on us, killed our beloved emperor, shamed us to the world, and look at who they put in charge!” This has “future coup” written all over it, and you can be certain they’ll hate all things American and more justifiably so than in Iran.