In one trailer for Oppenheimer, the movie about the making of the atomic bomb releasing on Friday, Maj. Gen. Leslie Groves (Matt Damon) asks Manhattan Project leader J. Robert Oppenheimer (Cillian Murphy): “Are we saying there’s a chance that when we push that button we destroy the world?” The chance, Oppenheimer assures him, is “near zero.” Groves is not wholly assuaged. “Near zero?” Oppenheimer, frustrated, asks what answer he wanted to hear. Groves, of course, speaks for the audience: “Zero would be nice!” I would love to tell you that concerns that the first atomic bomb would destroy the world...