Well then you’ve raised a strawman, because I don’t think anyone, including Ayn Rand, has claimed that free markets are the raison d’etre. Instead, free markets are a natural corollary of some other raison d’etre, namely that human beings possess a right libery.
right to liberty
That's no strawman - that's the root of my argument. Randian "Liberty" has no constraints other than not impeding on the liberty of others. It becomes all about the satisfaction of one's own needs, wants and desires. Rand rages against the entire notion of an obligation or duty toward others, which is at the core of traditional Judeo-Christian morality.
Our founders pledged their lives, fortunes and sacred honor for a cause greater than self. Rand was blind to any cause greater than self.