VENICE (Reuters) - Director Oliver Stone says the U.S. media and government have demonised Venezuelan President Hugo Chavez and other leftist South American leaders, and argues in a new film that they were right to stand up to Washington. Chavez, who landed in Venice for the film's premiere, has earned a reputation for his outspoken criticism of U.S. policy, and in Stone's "South of the Border" he is sympathetically portrayed as a hero of the people who refuses to be bullied. Originally an attempt to redress what Stone saw as unfair treatment of Chavez by TV networks and newspapers, the...