Why Literary Types (Often) Maintain Friendships That (Some) Public Intellectuals Can’t (on Ex-friends: Falling Out with Allen Ginsberg, Lionel and Diana Trilling, Lillian Hellman, Hannah Arendt, and Norman Mailer by Norman Podhoretz; Cleanth Brooks And Allen Tate: Collected Letters, 1933-1976 by Alphonse Vinh; & The Letters of Denise Levertov and William Carlos Williams by Christopher MacGowan)