Read Keynes. His writing makes no sense. You can only “understand” him and his Ism if you read his conclusions and ignore the inconsistencies and non sequiturs. His argument does not make sense linguistically. Politicians love him because he justifies control by “experts” and the pols are, of course, all experts.
There is no reason to fear Boom or Bust; they are the normal function of a free enterprise capitalist economic system for free people.
Boom or bust; highs and lows; ups and downs are anticipated events in a capitalist economy with a government whose only task is to protect property rights.