I did say "in short" OBTW...
Keynes was wrong, look at the mess we are in today with debt and how the government tries to counter cyclically control spending. It's a sham.
If the government would have stayed out of the way, you wouldn't have had toxic home loans in the late 90's and onward, to folks who couldn't afford homes. Then, when that balloon popped, the government forced other institutions to buy the shaky ones, further compounding the problem.
Then GM failed, and instead of letting the market correct on it's own and come out with a stronger GM run through bankruptcy or stronger yet competitors, we have the same faulty government controlled auto industry where no one can fail, and no one takes any meaningful risk to improve the products.
We had shovel ready jobs, that were never ready. We could have given the workers each $100,000 plus and told to go home and we would have been better off. We increased the dependency on the government by tripling unemployment times, making that a three year job vacation, instead of incentivizing returning to work, or returning to make more business's and more jobs.
This is the slowest, longest recovery from recession/depression in the history of modern economics, ever. All because someone thought Keynes was right. Except, now we get to try and pay off that debt for the next 20 years. Which we know won't happen, they are monetizing it as we speak.