There are too many handguns in the wrong hands in Camden, which had 54 homicides in 2004. But the city is fortunate that one of those guns was in the hands recently of a shop owner named Ngoc Le. An immigrant from Vietnam, Ngoc Le and his wife, Kelly, run a cell-phone and fishing-supply store in the city. On Dec. 31, they were working in the shop when a man came in and asked to buy a cellular-phone clip. As Kelly Le turned her back, the man jumped over a counter and grabbed her, holding a knife to her throat....