FYI: A bit long.
One hesitation I have with things like this, and it's probably a result of reading so many murder/crime fiction novels, is that it's so much easier to try to use existing clues, evidence, facts, etc. and fit them into a preconceived idea of what happened. Our subconscious wants to make sense of what we don't understand, and we usually look to the least complicated theories first. It's human nature, and that doesn't mean it's wrong. Law enforcement folks have the same kind of reactions, but because of training, education and experience, can seem to we laypeople as not caring or not knowing what to do with the "evidence."
It's scary to admit that we don't know what happened, or why, or how, because in our minds that lack of knowledge puts us at risk. We want answers, and we want them now. Because most of us are, truly, naive, about how clues and evidence, etc. can work together, we formulate our own thoughts about what's happened and don't understand why the law people don't understand us.
This, in a nutshell, is why I like (and at the same time roll my eyes at) Cold Case. There is a solution to every criminal case. And sometimes, long after the fact, that solution is found.