It was the summer of 1970, and the war in Vietnam was never going to end. B-52s were carpet-bombing Cambodia, gouging craters into its eastern hills; across the border, angry G.I.s were fragging their officers. Back home, radicals were bombing police stations and burning down banks. In May, the National Guard shot four students dead at Kent State. To paraphrase Yeats, things were falling apart; the center couldn’t hold.