I kind of get the feeling that Keynesian policy is similar to martingale. If you provide stimulus and it doesn't work out then you are in debt on top of previous problems.
You have the government operating deficits (for defense amongst many things). When you cut defense spending or any type of public servants you pile them onto the existing unemployment. Many might even be forced to take welfare benefits.
A dollar public spending cut will probably be much less than a dollar net in cuts.