The man authorities said detonated a recreational vehicle, killing himself in downtown Nashville on Christmas Day last year, was motivated by life stressors including paranoia, not social or political ideology, the FBI said on Monday. The FBI and law enforcement partners conducted a lengthy investigation into the bombing, which Anthony Quinn Warner was accused of committing. The probe found Warner, 63, acted alone in building and setting off the improvised explosive device which blew up his RV. The team, with the help of the FBI’s Behavioral Analysis Unit in Quantico, Virginia, looked into why Warner decided to act as he did. “Based on analysis of the information and evidence gathered throughout the investigation, the FBI assesses Warner’s detonation of the improvised explosive device was an intentional act in an effort to end his own life, driven in part by a totality of life stressors—including paranoia, long-held individualized beliefs adopted from …