ChesapeakeBarbara Rockwell has a soft way about her. Light brown hair swirls around her face, adorned by oval-framed glasses and gold elephant earrings.Her voice is comforting and doesn't become loud or sound angry when she takes delight in a certain man's death."The fact that he got blown up in a car," Rockwell said, pausing, "I don't know who did it, but I'd like to thank him."The man against whom she has held this grudge for more than 24 years was a Hezbollah commander named Imad Mughniyeh. The reason she held it is that her son, Marine Cpl. Michael Caleb Sauls,...