Let me elaborate. It's not the STATE of the country that produces the info. It's the reliability and trustworthiness of the government publishing the info. Hitler was totally insane, but his air leaders weren't. Many of the LW served their country and their arm of the military, NOT Hitler. So when the reports came out they were for people that needed to know the truth.
As opposed to Soviet reports, where everybody gave up any moral compass to save their collective skins. Throwing untrained bodies into the meat grinder was their main tactic and they did it with relish.
Now the Japanese.... Tough example. On the one had they had so little common sense and sense of reason that they thought charging machine guns while unarmed, for some guy 2000mi away sitting on a throne, was their duty. On the other hand, they understood their position with a bit of defeatism, and knew they were up against a massive enemy, so their military leaders were more likely to tell the truth. IMO you could go either way, but a lot of info seems to be pretty good quality from Japanese sources.