John Maynard Keynes was a charlatan. The government's embrace of Keynesianism is the basis for all of its wrong-headed thinking regarding the economy and the governments role in the economy.

If Keynes hadn’t come along, statists looking for plausible-sounding rationales from the economics profession would have invented him. To the extent there is any analytic rigor within economics, Keynes makes no contribution to it. His economics are politics with more than enough abstruse drivel to con the gullible. From Llewellyn H. Rockwell at lewrockwell.com:
https://straightlinelogic.com/2016/0...h-rockwell-jr/

Murray minced no words, referring to Keynesianism as “the most successful and pernicious hoax in the history of economic thought.” “All of the Keynesian thinking,” he added, “is a tissue of distortions, fallacies, and drastically unrealistic assumptions.”