To some of Keith David Hammock’s neighbors, the kids who had repeatedly hopped his fence to steal marijuana plants were merely doing what teenagers do. Swiping marijuana plants by the root was a dumb and reckless crime, but not a serious one — and it certainly didn’t justify shooting two boys, said a neighbor who identified himself only as Kevin for fear of retaliation. But to others living on the 2800 block of High Street and the surrounding neighborhood where Hammock, 48, is accused of fatally shooting 15-year-old Keylin Mosley and seriously wounding his 14-year-old friend, the shooting was the inevitable conclusion to an escalating series of crimes including graffiti tagging, car thefts and burglaries that made people worry about their safety.