The word “liberalism” is a tricky thing. As The New Yorker magazine staff writer Adam Gopnik discovered while promoting his 2019 book A Thousand Small Sanities: The Moral Adventure of Liberalism, its variants carry different political baggage from one Western country to the next. Its breadth renders it ideologically elusive, encompassing societies with social democracies, free markets, and shades of grey. Lately, its survival has come into question even in places where its future once seemed assured. But last Thursday in front of a near-capacity audience at the Frank Center for Public Affairs, Gopnik spoke passionately of liberalism’s origins, what…