AS OFFICIALS in Arnold Schwarzenegger's hometown of Graz, Austria, busied themselves by removing every mention of the movie star and California governor from city sites because he refused to grant clemency to a convicted murderer, next door in Germany a state parole board mysteriously let go another convicted murderer. His victim was a heroic U.S. sailor. Mohammed Ali Hammadi was convicted of killing Robert Dean Stethem, a Navy diver, during a hijacking in Beirut in 1985. A Washington Post editorial recalled a conversation Stethem had with a fellow passenger, a 16-year-old girl, after Hammadi brutally beat Stethem. . . "He...