Liberal democracies occupy a tiny sliver of the human experience, and their hold on the West is crumbling, the conservative journalist and author Andrew Sullivan warned Oct. 3 at Cornell.Sullivan joined Ezra Klein, editor-at-large of Vox.com, at the Law School’s Landis Auditorium in the second installment of The Peter ’69 and Marilyn ’69 Coors Conversation Series, titled “Is Illiberalism Corroding Our Democracy?”