The perception of evil

It can be argued pretty persuasively that we should not dwell upon, think about or enjoy the thought of evil things.  Scripture tells us to not even talk about the evil things that people go in secret.
But what about when evil is portrayed in a way that truly presents it as evil.  My point is this, so often, Hollywood will present evil as fun, beautiful, exciting, thrilling and advantageous.  But it is none of these things.  We should not be entertained by evil.   But what about when evil is shown as evil?
If there any way that this sort of presentation can be good or helpful?  What if it stimulates our thinking to growth and clarity?