Nobody was supposed to get hurt. This is the irony that drives Love & Death, creator David E. Kelley’s empathetic HBO Max docudrama based on the true tragedy that befell two young, churchgoing couples raising families in small-town Texas in the late 1970s. When starry-eyed Candy Montgomery (Elizabeth Olsen) talks pragmatic Allan Gore (Jesse Plemons) into having an affair with her, over the course of many anxious “strategy sessions,” the lovers-to-be agree: neither of their spouses, especially Allan’s psychologically fragile wife Betty (Lily Rabe), can ever find out about them.