Matthew Mata and Erika Gonzalez participate in a memorial service for the victims of Sunday's church shooting in Sutherland Springs, Texas, on Monday, Nov. 6, 2017. The suspected gunman had a history of domestic violence and sent threatening text messages to his mother-in-law, a member of the church, before the attack in which he fired at least 450 rounds at helpless worshippers, authorities said Monday.
Matthew Mata and Erika Gonzalez participate in a memorial service for the victims of Sunday's church shooting in Sutherland Springs, Texas, on Monday, Nov. 6, 2017. The suspected gunman had a history of domestic violence and sent threatening text messages to his mother-in-law, a member of the church, before the attack in which he fired at least 450 rounds at helpless worshippers, authorities said Monday. Jay Janner AP
Matthew Mata and Erika Gonzalez participate in a memorial service for the victims of Sunday's church shooting in Sutherland Springs, Texas, on Monday, Nov. 6, 2017. The suspected gunman had a history of domestic violence and sent threatening text messages to his mother-in-law, a member of the church, before the attack in which he fired at least 450 rounds at helpless worshippers, authorities said Monday. Jay Janner AP

Why are there so many mass shootings in the US? There is an obvious explanation, research shows

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