"Too bad it gets spent as soon [or before] it gets returned."
The ability to stop deficit spending when the economy recovers requires the ability to spot that turn in the economy; in other words market timing. Politicians tend to be behind time, for a good reason: their careers depend on popular opinion, which as we know is a contrarian indicator when it comes to market timing. Keynes personal investment history is very relevant: his massive loss indicated a complete inability to spot turns in the economy. If he were in charge, he would have kept pumping in 1928 instead of taking away the proverbial punch bowl. Presumably, he did not relish the prospect of losing his own money.
In Keynes' defense, his 1936 tome "General Theory" itself did not actually invent "Keynesian Economics." It was merely an intellectual cover for what had already been in practice by various governments in Soviet Union, Italy and Japan since the 1920's, Germany and the US since 1933.
Market Data 
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