Well, this is what we know actually happened after the decision to fight on. So that's our baseline. I agree it was a horrible outcome, hence the scepticism of the decision.
It's hard to imagine any alternative outcome as bad as that one actually, apart from the satisfaction of beating Hitler at the end.
Yeah. Right...
Would have been even worse if England kept appeasing and USA stayed neutral.
Racial purity (which resulted in ethnic cleansing) and expansion policy ("Lebensraum") were cornerstones of Nazism and planned long before WW2.
I mean Dachau KZ was already operational in May 1933.
Therefore war was inevitable for all neighbors and by association / alliance for England and France.
Hitler then declared war on the Soviet Union in 1941 breaking the supposedly peaceful Molotov-Ribbentrop Pact.
And then declared on USA.
I think you need a history lesson.
I have never met a person who says "you need a history lesson" who had a solid grasp of history.