By Diane Rommel The world’s premier literary festival wrapped up recently in Hay-on-Wye, a tiny village on the Welsh side of the English border, home to a castle, an ice cream parlor, and more bookstores per capita than just about anywhere. The Hay Festival, which runs through late May through early June, is like Sundance for intellectuals — in practice less a festival about books, per se, than about ideas, where just this year world leaders like former Secretary of State Hillary Clinton and Scotland’s First Minister Nicola Sturgeon appeared under the same metaphorical tent as Benedict Cumberb…