Was there anyone in America, England, Austraia, Canada, New Zealand, India, and the smaller allied countries who DIDN'T celebrate the abrupt end of WW2 AT THAT TIME? Regardless of what it cost the then enemy?

I know my family did. They had three in uniform and one a prisoner of the Japanese.

Hindsight is a brave thing, but you can do nothing at all in hindsight. Hindsight is for scholars who were not in uniform and carrying a bundook in the 40's.