For one Baptist minister in South Florida, the response to the most recent school gun massacre is visceral. Joe LaGuardia, pastor at First Baptist Church in Vero Beach, graduated in 1996 from Marjory Stoneman Douglas High School, where one of his best friends was fellow student Aaron Feis — the assistant football coach and security guard who died protecting students from gunfire. What’s more, his father was killed in a mass shooting in Pennsylvania in 2013.