We all know why people would have liked to see Germany win.

The reason i thought it was a critical mistake for britain to declare war on germany instead of siding with them against tbe Soviet Union was because the soviet union represented a much greater threat to the western world and way of life.
By siding with germany and allowing them to finish off the soviet union:
Communism is strangled in its cradle and never spreads. The soviet union/cold war never happens. China doesnt go communist. Korean war doesnt happen. Vietnam doesnt happen. The spread of socialist ideology throught the western world maybe doesnt happen. Western europe retains their global empires, the western world and western ideology remains supreme, china is an ally.
By siding with the soviet union against germany:
Western europe is destroyed and left in ruins, britain loses their entire empire and world power status, western europe greatly weakened, western power in the world greatly reduced, soviet union/communism occupies half the continent, soviet union becomes a global superpower, cold war ensues, china goes Red and becomes an enemy/rival, wars in korea and vietnam, north korea happens (lol), socialist ideology spreads around the world, including the west, where it is firmly entrenched to this day.
That is why i wish we hadnt fought germany. The real enemy of the west was always the soviet union.