Ah. You study at the University of Chicago or something, I guess? Such opinion is extreme ideology and is hard to take seriously. For example:
> Government spending does not "stimulate" the economy.
I see. I suppose that is why the major banks downgrade their GDP estimates as a result of the prospects of decreased government spending? And why the UK economy nose dived as a result of the austerity package?
> The value of a theory is measured by its ability to predict... yet Keynesians have never predicted any major economic events... even though Monetarist and Austrian economists have.
Monetarism quite correctly predicted the stagflation. It is failing miserably in the current situation of liquidity trap, however. It predicted that Japan will recover 10 years ago after increasing the money supply, for example. Nothing happened. The effects of QE2 were far smaller than predicted, etc.
Austrians: Even Milton Friedman did not think that theory had much to do with reality.
Also, all of those theories were predicting massive increase in inflation and/or long term interest rates due to the economic policy in the past two years. What happened? The interest rates are at historic lows instead. That's a massive failure of the predictions.
Only the liquidity trap theory predicted what happens accurately. And it is a consequence of the Keynesian theory.
The way to fix the economy in a normal, non-liquidity trap situation (i.e. almost always) is through monetary policy exclusively, no question about that.
Monetary policy does _not_ work well at this very moment, however. A fiscal stimulation is needed to get the economy out of the swamp and get the interest rates above 0%. After that we can revert to monetary policy again.