Excuse me, but playing with plastic WWII soldiers in 1950 is not demonizing Japanese and Germans. But, yes, if you are American the Japanese and German soldiers were the enemy for WWII games.
I don't know of any responsible government agency, or major political party that still considered the former enemy as a current one then. Did some individuals? Probably. Did Americans on the whole? Assuredly not. We were sending CARE packages to Europe, includig West Germany. We were building a democatic Japan. We were in love, by and large, with United Nations agencies--UNESCO, WHO, etc. We had moved on to dealing with the 'Communist Menace.'