It was Sept. 11, 2009, just outside a high school in the small Michigan town of Owosso when Jim Pouillon, 63, was murdered for doing what he thought was right: protesting against abortion, which he considered murder. Like many pro-life activists, the elderly Pouillon, a volunteer with Operation Save America who relied on an oxygen tank to breathe, was peacefully holding a sign featuring a graphic picture of an abortion victim. He had been trying to stop abortion since 1988. The goal of his particular brand of activism: force people to visualize and understand the reality of abortion, and to...