You want the audience to get your movie, and you want the audience to like it. It's as simple as that. If they don't understand what you're trying to say, you've failed. Of course, you can't get 100 percent of the crowd to understand the movie, but you know when you've reached the people you want to reach.
Most people are mirrors, reflecting the moods and emotions of the times; few are windows, bringing light to bear on the dark corners where troubles fester. The whole purpose of education is to turn mirrors into windows.