A father and a mother used the word “murder.” A brother said he won’t second-guess decisions made in the heat of battle. The families of three Americans killed in the Sept. 11 U.S. consulate attack in Benghazi, Libya, are offering widely different reactions to recent reports that U.S. personnel issued several requests for help that were turned down. Patricia Smith, the mother of slain State Department employee Sean Patrick Smith, is now blaming President Barack Obama for her son’s death. “I believe that Obama murdered my son,” she said Thursday from the living room of her Clairemont home. “I firmly...