There was a great American Psychologist by the name of Carl Rogers, and he believed that people need to keep their thoughts, feelings, and behavior, congruent in order to be happy, people need balance, and if any one of the three changes then it changes the whole thing.
So with the Entertainment Industry, with movies, music, poetry, books, art, dance, etc, if you change how people feel, and how they think, then you can change how they behave. If a movie can change how someone thinks and feels, then it can change how they behave. Education changes how people behave as well.
Once people learn and rise and as their lives get better, and as they learn better ways of living, then they do not want to go back to living the way that they did before. That is how our world evolves, and that is how we can have a better world, with kinder people and with less war, etc.
Movies, and poetry, etc, do make a difference in the world. We can change the world, and people such as H.G. Wells totally believed that as the top level of people share their work with the world that it will change the world.
Salute,
Tony V.