TLDR,
I got as far as unraveling Milton Friedman, and gave up. I'm ADHD
For me it is about principal the rest is noise.

Keynes isn't the problem. He may not have had Hayek's logic but he understood human greed and spite better than Hayek, and sort a system to manage it. The beauty of Hyaek's approach is it is closer to the order of nature and doesn't need to be managed.

Why you shouldn't dismiss Marx is because his teachings show us how that we need to make the free market work and by eliminate monopolies the tool of greed that screws up the free market. *edit*

Friedman a charismatic friendly spokesperson with a sharp mind, is easy to dismiss on principle he undermines everything Keynes has done to maintain checks and balances in the market, uses Hayek's teachings to prove the free market is the solution but he distils the Keynesian model down to a single point of control and sanctions a monopoly through monetarism, and gives control to elite bankers. While much of his teachings are good he is ignorant to greed and the imbalance he has created in giving control of the money supply as a monopoly to private bankers.

If you have an intellectual problem with the idea of the Fed, you are at odds with Friedman.