Arguments from authority are often not fallacious at all, when the authority in question is actually knowledgeable. See: https://www.dropbox.com/s/pbbxl5d4yzm9a53/2015-Boudry-The%20Fake%20the%20flimsy%20and%20the%20fallacious-Argumentation.pdf?dl=0

Also, I have looked in detail at Rand’s philosophy, and found it wanting:

About Objectivism, part I: Metaphysics

About Objectivism, part II: Epistemology

About Objectivism, part III: Ethics

About Objectivism, part IV: Politics

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