So you think we should have fought WWII without raising the military budget above 1941 levels?
Of course not. And neither would Austrians.
There is a difference between an event outside of economics that you need to respond to (like a war or an epidemic) and an event inside economics that you decide how to respond to (such as, to name the previous three instances, 1997-1998 currency/Long Term Capital Management crisis, 2000 Dot.com bubble crash, 2008 MBS bubble crash).
Now, we have the 2020 crash. Some money is needed to deal with SARS-2. But of $4 trillion, only a smaller portion is going to be used for SARS-2. Most of it will go to companies that have problems because, long before there was SARS-CoV-2, they packed themselves to the gills with bad debt.
We've had a decade of zero (!) interest rates. Totally as expected, it blew the biggest bubble the world has ever seen. SARS-2 is a pin, but if not for SARS-2, it eventually would have been something else. We must deal with SARS-2. But, for economic health, the lanced financial bubble should be allowed to fully drain.
How I see it for the past several cycles:
1997-1998 currency/Long Term Capital Management crisis
-- Asian currency crisis causes hugely levered Long Term Capital Management to implode.
-- Fed/gov fearing contagion (because LTC was levered up to about $1 trillion in derivatives) injects huge liquidity.
-- Liquidity always goes somewhere, this time into the new thing of dot.com stocks.
-- The dot.com bubble inflates to silly proportions.
-- All bubbles eventually crash, and . . .
2000 dot.com bubble crash
-- No real trigger other than valuations just got too absurd. NASDAQ goes down 80% from peak.
-- Fed/gov injects huge liquidity.
-- Liquidity always goes somewhere, this time into real estate and new-fangled derivatives, CDSes and MBS's.
-- The MBS bubble inflates to silly proportions.
-- All bubbles eventually crash, and . . .
2008 MBS bubble crash
-- No real trigger other than valuations got too absurd. Chain of firms levered to the gills on garbage debt and swaps start to blow up.
-- Fed/gov injects injects largest liquidity in history of the world.
-- Liquidity always goes somewhere, this time so much liquidity that it goes into everything: stocks, bonds, real estate, and debt of all types.
-- The Everything Bubble inflates over 10 years of 0% interest rates.
-- All bubbles eventually crash, and . . .
2020 "Covid" crash
-- SARS-2 turmoil. Companies levered the hilt on garbage debt immediately are in trouble. They spent all their money from the good years on buying back stock and adding to their debt.
-- Fed/gov starts injecting more liquidity at faster rate than even 2008.
And, here we are.