Scott Gimple extends his apologies to everyone who abandoned “The Walking Dead” after the bloody seventh season premiere. He also mourned the demise of Steven Yeun’s Glenn, the conscience and heart of Rick Grimes’ band of survivors. What can he say, other than . . . hurt people hurt people. “I really didn’t mean to hurt you,” he told me during a recent conversation we had in Pasadena, Calif., quickly adding, “but Robert [Kirkman] hurt me!” Gimple was referring to Kirkman’s long-running horror comic, where Glenn died on the page years before his fatal onscreen exit. But the audience’s reaction and subsequent revolt taught him how powerfully we’d connected to the franchise’s most popular characters. While the showrunner believes what he did was necessary, he still wishes “they would keep watching to see what happened and how that affected everyone and shaped the story.” Think of “The Walking Dead: The Ones Who Live” as Gimple’s way of making amends. The limited series resumes the love story of Rick (Andrew Lincoln) and Michonne Grimes (Danai Gurira) following their years-long …