In Hindu mythology, Asura are the bad beings. Asuras always try to steal the place of Devas because they didn't get it. Indra is a king of Devas/Suras.
So in short Indra (Deva) is depicted as good being in Hindu mythology and Asura as bad beings and Naruto is inspired from Hinduism/Buddhism, so why is the adaptation of Indra and Asura made opposite to their real self? Have the makers explained it ever?