The 18-year-old who massacred 19 students and two teachers in Uvalde on May 24 had no experience with firearms before his rampage began. He targeted an elementary school with an active shooter policy that had been deemed adequate but also a long history of doors propped open. No one was able to stop the gunman from carrying out the deadliest school shooting in Texas history, in part because of “systemic failures and egregious poor decision making” by nearly everyone involved who was in a position of power, a new investigation into the shooting has found. On Sunday, a Texas House...