Because this film shows exactly the sensitive and controversial point between the two branches, Shia and Sunni. Sunni's don't believe in this film, because Omar, Abu Bakr and Aisha, who are all three respected figures of the Sunnis (Omar and Abu Bakr as the second and first caliphs of Rashidun and Aisha as Umm Al-Mu'minin) are completely hated and enemy of prophet in this film. The reason why some Shiites do not accept the film is that they believe that the film causes differences between the Shiite and Sunni branches and basically, such films should not be made that destroy the holy figures of the other branch of Islam.
