Nope. In fact the occupation of Germany was pretty brutal. (Dunno as much about Japan...)
For example, after WWII, there was a coal shortage. With winter approaching available coal was routed to France, the UK, etc. Germany was slighted because it was felt that the US occupation force would have fewer problems shooting German civilians if they rioted... There were no “kid gloves” for the losers back then.
IMHO, the current issue derives from the treaties on the laws of land warfare that were signed AFTER WWII. Roughly translated, they seem to read “The US is not allowed to use its full might to bring a war to an absolute and satisfactory conclusion.”
“For example, after WWII, there was a coal shortage. With winter approaching available coal was routed to France, the UK, etc. Germany was slighted because it was felt that the US occupation force would have fewer problems shooting German civilians if they rioted”
Not that I don’t believe you, but how much was perception and how much reality? How likely was it that a German citizen would be shot, and how often were U.S. soldiers arrested in the aftermath? How easy will it be decades from now to warp random instances of shooting civilians, pissing on corpses, and disrespecting (or not) holy texts into a pattern of brutality? Afghans are doing that already.