Both sides? Do you make the same argument for hearing from literal Nazis? You just need to weigh the arguments for and against the final solution? I'm not directly calling Libertarians Nazis but the analogy holds, I find very little of value from their point of view. Generally Ayn Rand type libertarians are cash worshiping dragons of the Smaug variety. Their only real contribution to discourse is about the power of markets and I think we can discard them because belief in markets is not unique to them.

What do libertarians have to do with a central bank executing a massive increase in its balance sheet to execute a nearly unprecedented intervention into the national economy?

There are many words I might use to describe this policy. Libertarian is not one of them.