NOW THAT South Africa has become more of a black-on-black killing ground than a white-on-black one, the stars who set the moral tone of the world are looking for another cause. US failure to restore Jean-Bertrand Aristide to power, and its determination to repatriate fleeing boat people, have united a host of 'Celebs for Haiti'. Among the worthy are Robert Redford, Paul Newman, Bob Dylan, Dustin Hoffman, Harry Belafonte, Susan Sarandon, Danny Glover, Mike Nichols, Charles Dutton, Milos Foreman, Julia Roberts, Ruben Blades, Francis Ford Coppola, Anthony Hopkins, Spike Lee, Jack Lemmon, Robert De Niro and Gregory Peck. Celebrities offended by being overlooked are reported to be searching for a rival cause. Suggestions from readers welcome.