Because it wasn't doing "just fine"...unless you're a democrat.
Now you've had to bring in the election to attempt to justify your position.
Hence one of the reasons I keep saying you continue to move the goalposts.
But I've moved no goalposts because "just fine" was the opinion of the majority of 1940 VOTERS who reelected President Roosevelt for a THIRD term.
Almost none of those 1940 voters wanted to go to war against Nazi Germany just to further reduce their unemployment numbers, and FDR promised them, saying "I hate war!"
Seriously, what exactly is your problem with this?