In case you missed the news, a 22-year-old man opened fire at a Tucson Safeway grocery store today, killing at least six and injuring a total of 18. U.S. Representative Gabrielle Giffords was at the grocery store and was shot in the face; she is recovering following surgery. John M. Roll, a senior U.S. District judge in Arizona, who was also at the grocery store, died along with a 9-year-old girl and at least four…