Everyone knows governments need to tax before they can spend. What Modern Monetary Theory presupposes is, maybe they don't.
We're experiencing exactly what happened in the 1930s, and they had all the answers back then. So why not follow their advice now?
The US spends hundreds of billions of dollars on wars and sends thousands of soldiers around the world to fight in them, but it seems unable to translate all that might into anything that could be called victory.