The morality question needs to be carefuly phrased. Inasmuch as moral behavior is observed by choices, there is no morality of movies. There are moral choices made by the production team, actors, and viewers/participants. For example, an otherwise excellent movie might tempt a person (to unrighteous anger, for example), and so that person makes a moral choice to not see a film.
Other choices are made in production, such as Steve's citation of
The Last Temptation (and whose opinion of the film I share). However, you might be interested to know that the film was selected to be part of an
annual Christian film festival many of us will attend (consider yourself invited).
Mike_H on this board runs the Flickerings festival and may be able to comment on that film's selection.
The effect of these choices are varied. Some will merely have social effects, such as Tom Cruise's language in
Magnolia excluding the film from many discussion groups uncomfortable with that language. Others effects may change over time, such as
The Birth of a Nation now serving as an example of outrageous racial bias.
With regards to the specific films cited, I have only seen
Do the Right Thing,
Natural Born Killers,
Requiem for a Dream, and
Vertigo.
Do the Right thing has served me well in church discussion groups as an excellent example of the complexity of racial issues, anger, and just plain good film-making. The only troubling issues is the sex scene in the film, not becuase it's there but because it limits the film for group discussion. I'm not sure the scene really contributes to the film. The language isn't an issue, really.
I haven't used
Natural Born Killers in a group, but it probably has the same issues as
Kill Bill: Some people just won't "get" the use of violence. In my mind, NBK was a commentary on the media and violence (including local news, as I recall). It was a bit over the top, but how could a combination of Tarantino and Stone not be? As an example of the effects of violence in film,
my church is running a discussion group based on
The Passion of the Christ--for battered women overly affected by the violence on the screen.
I consider
Requiem for a Dream to be a very good film. Startlingly original, wonderfully acted. It's a great example of how ugliness can be used to illuminate us and illustrate truth. I think the sodomy scene at the end might be too intense for many viewers (and warrant exclusion from some church groups), but it does serve to illuminate the utter humiliation and bondage of the characters. Not an easy film to watch.
Can you give me an idea what the moral issues of
Vertigo are? It's been a while since I've seen it.