Discussion has centered on such themes as the conflict between modern human and nature, and the film's treatment of imperialism, racism, militarism and patriotism, corporate greed, property rights, spirituality and religion. Commentators have debated whether the film's treatment of the human aggression against the native Na'vi is a message of support for indigenous peoples today, or is, instead, a tired retelling of the racist myth of the noble savage. Right-wing critics accused Cameron of pushing an anti-American message in the film's depiction of a private military contractor that used ex-Marines to attack the natives, while Cameron and others argued that it is pro-American to question the propriety of the current wars in Iraq and Afghanistan. The visual similarity between the destruction of the World Trade Center and the felling of Home Tree in the film caused some filmgoers to further identify with the Na'vi and to identify the human military contractors as terrorists. Critics asked whether this comparison was intended to encourage audiences to empathize with the position of Muslims under military occupation today.