To quote the Wikipedia article, "While some early reports in Hindi and a New York Times article did not identify the victims to be from the Dalit caste, they were erroneously identified as being Dalit in a Reuter's report by Nita Bhalla on 29 May. It was later widely reported based on Reuters that they were not Dalit but in fact, they were of the Maurya caste, which is often thought to be equal in social ladder to the Yadav caste.". This movie is far from the truth. If they're trying to give a message, at least they should get the technicality right.
I don't understand why Bollywood is so bent on spoiling the image of Brahmins. The SC/OBC have been given reservations and all facilities from the government which they utilize to a maximum extent.
What about giving equal rights to everyone BPL including poorer Brahmins? Why is no one making movies about these topics? Article 15 talks about equality not downgrading one caste for another. Some may argue that the hero is Brahmin but that barely changes what the film is wrongfully portraying.