Katherine Maher has a golden résumé, with stints and affiliations at UNICEF, the Atlantic Council, the World Economic Forum, the State Department, Stanford University, and the Council on Foreign Relations. She was chief executive officer and executive director of the Wikimedia Foundation. And, as of last month, she is CEO of National Public Radio. Mere weeks into this new role, Maher has stepped into controversy. Long-time NPR senior editor Uri Berliner published a scathing indictment of the self-professed “public” media service’s ideological capture. Rather than address the substance of these criticisms—which will ring true to anyone who has listened to...