Justin Chang: 'Oppenheimer' doesn't show us Hiroshima and Nagasaki. That's an act of rigor, not erasure

The key word in Christopher Nolan's "Oppenheimer" is "compartmentalization." It's a security strategy, introduced and repeatedly enforced by Col. Leslie R. Groves (Matt Damon) in his capacity as director of the Manhattan Project, which is racing to build a weapon mighty enough to bring World War II to an end. In Groves' mind, keeping his various teams walled off from one another will help ensure the strictest secrecy. But J. Robert Oppenheimer (Cillian Murphy), the brilliant theoretical physicist he's hired to run the project laboratory in Los Alamos, New Mexico, knows that compartmentalization has its limits. The success of their mission will hinge not on isolation but on an extraordinary collaborative synthesis — of physics and chemistry, theory and practice, science and the military, the professional and the personal.

In the weeks since "Oppenheimer" opened to much critical acclaim and commercial success, Groves' key word has taken on an unsettling new meaning. Compartmentalization, after all, is a pretty good synonym for rationalization, the act of setting aside, or even tucking away, whatever we find morally troubling. And for its toughest critics, many of them interviewed for , "Oppenheimer" compartmentalizes to an outrageous degree: In not depicting the atomic bombings of Hiroshima and Nagasaki, they argue, the movie submits to a historical blindness that it risks passing on to its audience. Nolan, known for crafting fastidiously well-organized narratives in which nothing appears by accident, has been taken to task