About” who made the film and why”

I know film is actually a way of promotion but I was surprised politics use the film to promote their position and express their culture, too. I was thinking if The God Father could be so popular during that time is that because the God Father corresponds to the time tends in 60s. As the article mentioned, the film is to make money so what made the director believe the God Father could make money？The amazing thing about the God Father is it is still popular today and many people said it is the movie that a boy must watch after he is old enough. Therefore, it is hard to make sure if the audience today have a same attitude toward the God Father with people in 60s. Therefore what is God Father’s zeitgeist today is also a question to consider.