In this way, they wanted to justify

In this way, they wanted to justify monetarist view that changes in money supply, especially these designed on purpose by the government are the primary cause of economic depressions

Against Keynesians, they argued that changes in money supply introduced by government are the main cause of business cycles, while Keynesian reasons (changes in aggregate demand) are less important

So, it is not capitalism and businesspeople which are to be blamed for business cycles, but the government