How else do you rebuild an economy that just had a huge bubble pop in one major industry, has the dust bowl going on, and has knockon effects destroying the entirety of peoples savings?

Greece tried to tighten their belt and tax their way out of it, just led to compounding double digit economic contraction.

Instead, when we have bubbles pop, we usually inject money into the economy to keep economic carnage like that at bay, and in the 1930s we created a jobs program so as to put those funds to effective use. This has worked well for the US, as compared to Greece.