Seinfeld' is not non-leftist because somebody yelled at them. Different kinds of people started writing the shows. We need different kinds of people in Hollywood. We are already getting some. We need even more.
Visual media are very effective at conveying story, emotion, feeling and opinion.
I would be the first to admit that this needs to be balanced by the kind of thinking that is promoted by words and print. Yes, the Church right now tends to be totally silent on this kind of issue. We are leaving our people defenseless. By the way, it's also hard to draw lines between different forms of visual media. Sure they do.