Substituting a goat And in other miracle-related news, some people in Hollywood decided to stand on principle. The issue was Mel Gibson, charismatic movie star, Oscar-winning filmmaker and drunken, bigoted, death-threat-issuing lout. Gibson was supposed to make a cameo in "The Hangover 2," the sequel to the 2009 hit "The Hangover," but was booted from the production , reportedly after cast members -- supposedly led by costar Zach Galifianakis -- told the film's director, Todd Phillips, that they were uncomfortable working with Gibson. The cast apparently was not uncomfortable appearing in the last "Hangover" opposite convicted rapist and onetime mugger Mike Tyson, who subsequently told ESPN radio that he did the cameo "for drug money." [. . .] If artists should be publicly censured and denied employment on the basis of offenses they commit in private life, how come Gibson is a pariah right now for threatening and hitting his ex-g...