The Unlikeliest Cult in History
The cultic flaw in Ayn Rand’s philosophy of Objectivism is not in the use of reason, or in the emphasis on individuality, or in the belief that humans are self motivated, or in the conviction that capitalism is the ideal system. The fallacy in Objectivism is the belief that absolute knowledge and final Truths are attainable through reason, and therefore there can be absolute right and wrong knowledge, and absolute moral and immoral thought and action. For Objectivists, once a principle has been discovered through reason to be True, that is the end of the discussion. If you disagree with the principle, then your reasoning is flawed. If your reasoning is flawed it can be corrected, but if it is not, you remain flawed and do not belong in the group. Excommunication is the final step for such unreformed heretics.
http://www.skeptic.com/reading_room/the-unlikeliest-cult-in-history/