1. The Air Force failed to enter the Texas gunman’s domestic assault charge into a database that would have prevented him from buying a gun.

The gunman, Devin P. Kelley, was apparently motivated by “a domestic situation.” His mother-in-law attended the church he attacked, and he had sent threatening messages, a police spokesman said. In 2012, he was convicted of attacking his wife and infant stepson, fracturing the child’s skull and leading to his bad conduct discharge from the Air Force.