Primates raised for entertainment are often separated from their mothers as babies, which means they don't get the chance to learn how to feed and clean themselves, or socialize properly. Film sets are stressful enough places for humans; imagine how overwhelming they are for captive animals, who are under pressure to perform on tight schedules.
Some major companies, like Volkswagen, Burger King, and Johnson & Johnson, have signed pledges not to use any primates in their advertisements.
Even films that get the "No Animals Were Harmed" stamp from the American Humane Association have turned out to have horrific abuse violations. The safest way to make a movie with exotic animals is not to use them at all. But filmmakers can rest assured that amazing CGI technology makes it possible to make a movie featuring animals without harming a single one.
The Australian government now has the chance to deny the "Pirates" primate permit and tell the entertainment industry that we don't need to mistreat animals to make a great movie.