Some 'negative' movies that make us feel unhappy are actually waking us up to the state of certain problems though? I don't mean horror movies like SAW etc. which are pretty grotesque and horrible, and which I cannot watch on any level at all. But there are movies that make me cry, or make me angry, usually because they portray injustice or situations that DO occur in real-life, quite often.
Being aware of a problem, is often the first step to correcting it, right? If nobody had ever created media showing how it was wrong to 'own' someone based on gender or race, we would probably have never broken away from that state of society, and many people would be stuck in lives of extreme suffering thanks to skin colour or gender (or disability).
Even some action movies explore darker questions occasionally, although not often enough.
I think it depends on the movie, and what's being portrayed. If we are taught to identify with, and like someone who is being treated unfairly, then the movie might inspire us to change that situation. On the other hand, if it glorifies vengeance killing and pointless gore then at best it leaves us unaffected, and at worst it makes us revel in it.
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