I love those old James Stewart films, like "Mr.Smith Goes To Washington", "Harvey" and "It's a Wonderful Life", all of which are moral fables too. "The Man Who Shot Liberty Valance" is another James Stewart film, which takes on complex moral dilelmnas. I found the sacrifice of Tom Doniphon (played by John Wayne) pretty inspiring too. He surrenders his integrity and self-respect by committing a cold blooded murder of a man whom he neither fears nor is threatened by. The sacrifice promptly destroys him and he dies as a forgotten pauper.
A more modern film, which really inspired me, because it is about the power of love as a healing force, was the sentimental, but beautifilly acted John Thaw piece, "Good Night Mr. Tom".
Charlie Chaplin's epic speech at the end of "The Great Dictator" never fails to choke me up either!