As a college student in Chapel Hill, John Allison stumbled across a collection of essays by Ayn Rand and was hooked by her philosophy of self-interest and limited government. As he rose over the decades to chief executive of BB&T, one of the country's leading regional banks, Rand remained his muse. He's trying to replicate that encounter through the charitable arm of his Winston-Salem-based company, which since 1999 has awarded more than $28 million to 27 colleges to support the study of capitalism from a moral perspective. But on at least 17 of those campuses, including UNC Charlotte, N.C. State...