CHESTER — The pale fluorescent lights of the historic old Chester County Courthouse gleamed off the black barrel. The darkness of that barrel stood out, even in a courtroom packed with more than 90 people there to see what happens when guns with long black barrels are fired. What happened on this hunting trip is somebody died. This somebody, in October 2008, was a Hmong refugee from Rock Hill who worked in a warehouse. His name was Touna Xiong. Pronounced, simply, as “Tuna Song.” The song, clearly Tuesday in that courtroom for everybody involved, was a lament. The father of...