This is becuase I love stories and a story without an ending is extremely depressing to me.

However, Zodiac was one of the rare exceptions to that rule, as the slightly depressed feeling the ending left me with matched up perfectly with the mood and tone of the rest of the movie. It just made sense to leave the story where it was and not force some attempt at resolution.

Somehow I don't think the Knox case will lend itself to that type of ending. For one thing the case is still fresh and the principles are still alive, so it's still possible that the case will be fully solved at some point.

Zodiac worked as well as it did because it was a long-dead case that had about .00000000000001% of ever being cracked at this point. Leaving the ending hanging was just the only way to do it because it's likely nothing new about the case will ever come to light again; what is known now is probably all we will ever know.

Knox's case has that air of mystery but it's WAY too soon to start assuming it will remain such a puzzle. It would really suck if this movie came out and had this open ended finale where the view is left with the question "did she do it or not?" and then like a year later something new comes to light that changes the facts of the case.

Really, it's just too soon to pull the trigger on this movie. They need to let the case develop naturally, and once we get to the point were nothing new has happened for like 10 years, THEN it's time to make the movie.