Few people are solely or even consistently rational. A great many people are emotional, intuitive, and mystical much of the time. And what does "enlightened" mean? It means something entirely different to a religious person than it means to a Randian atheist.
Even the people--perhaps especially the people--who are convinced they are rational and enlightened are generally emotional, pigheaded, and dangerously ignorant in their biases much of the time.
A wise person is a humble person and would never be so smug or proud as to insist he consistently sees and thinks rationally or even that rational thought always yields the best answer. A wise conservative understands that some human institutions that proud "rational" free-thinkers disdain as irrational and unprogressive are actually of fundamental importance to the stability and health of any society. Chief among these are religion and the traditional family. These institutions are not "reasoned" into existence. They grow organically over decades, centuries, and even millennia in response to felt human need. They prove their worth by their staying power.
The worst times in the lives of any people are when these institutions are attacked by intellectual do-gooders (perhaps we should call them "can do it betters") bent on creating a more rational society by excising the "bad" elements of tradition and so-called superstition.
Ayn Rand and her objectivist acolytes are "can do it better" intellectuals. They are far from humble. They are Jocobin-style ideologues who would cheer the elimination of every tradition and institution of time-tested value (e.g., religion, the nuclear mom and pop family, etc) that they adjudge irrational, superstitious, and unenlightened just as quickly as Marx sought to destroy these same institutions in the name of "progressivism."
Wise, careful conservatives honor the balance and the tension between the rational and the intuitive, and always keep a sharp eye on ideologues who are overbalanced to one tendency or the other. In paraphrase of Reagan's oft-repeated dictum I might say the most frightening phrase in the English language is, "I'm a rational and enlightened person and I'm here to help you overhaul your society."