White people like the white saviour narrative, because they can identify with the white protagonist, who is absolved from white guilt and becomes a white hero for people of colour to worship. When the white protagonist joins the group of people of colour, white people imagine that it is possible for a white person to purge his whiteness, and hence, to free himself from white guilt and responsibility. Paradoxically, not only does the white protagonist rid himself of white guilt, but he also becomes the hero, the saviour, the superior group member because he is white.
Moreover, in the white saviour narrative, all the people of colour collectively bow down or even prostrate before the white protagonist to symbolize the white person’s superiority over all people of colour (such as in Avatar, after Jake Sully tames the Toruk), and to indicate the submission of people of colour to white leadership. The white protagonist is smarter, better, faster, or stronger than people of colour because of his whiteness. The story’s internal logic requires a reason for the white protagonist’s unique superiority, so it is usually his white culture that makes him superior. Superior white culture takes the form of symbolically white technology (telescopes, rifles, Western marksmanship in Dances With Wolves), white skills (American military training in The Last Samurai), or white knowledge (scientific reasoning from the white protagonist in Avatar, who happened to be characterized as being below-average in both science and reasoning).