Yeah, I definitely agree that every viewer projects their preconcieved worldview onto the movies they watch. That's why there's so many white guys who misguidedly love The Joker, or Fight Club, or American Psycho, or Wolf Of Wall street... etc etc. I suppose to each of us 'change minds' means something different. You're right that no one is getting flipped by a film, but you can still be influenced by it.

Films can still inform though - I've watched some films with family members over the years where they'd get to the end and say that they couldnt believe that something like that was going on in the world right now/happened in the past. Beasts Of No Nation about the child soldiers, plenty of civil rights focused films, stuff about Native Americans. I'll go back to the breaking bad example - my family isn't american - my mother used to vote for the Tories in Britain. I found out she'd watched and enjoyed Breaking Bad, so I linked it to how the Tories are trying to privatise our NHS, and basically said that Heisenberg could be her some day. She had a bit of a revelation and seems to have flipped sides.