NORFOLK, Va.—A city engineer who fatally shot 12 people in a Virginia Beach municipal building in 2019 “was motivated by perceived workplace grievances” that “he fixated on for years,” according to findings released by the FBI on Wednesday. The investigation, conducted by the FBI’s Behavioral Analysis Unit, found that DeWayne Craddock “struggled with how he perceived his own work performance and how others at work viewed him.” “The shooter’s inflated sense of self-importance contributed to this conflict and led him to believe he was unjustly and repeatedly criticized and slighted,” the FBI said in a news release. “Violence was viewed by the shooter as a way to reconcile this conflict and restore his perverted view of justice.” But the FBI cautioned that no person or group was in a position to “see the confluence of behaviors that may have forewarned the attack” because Craddock had purposely isolated himself and disengaged …