re: I forgot about "Lilies of the Field".
I thought of Lilies of the Field after you typed your message above, but had forgotten about the films Tom listed.
Movies today have certainly evolved a lot from Jimmy Stewert's day. I think you can find some more modern movies with morally decent people in them however. Kevin Costner's charachter in Field of Dreams. Brad Johnson's character Ted Baker from Always. Tom Selleck's character in Quiggly Down Under.
Those are still all white males however, so how about Kimberly Elise's character Helen in Tyler Perry's film; Diary of a Mad Black Woman.
I'm sure there is more to add to the list as well.