What you find to be “obvious” is a series of assumptions and inventions that serve your pre-conceived fault assignment effort. I’m a little more interested in the actual facts of the case, and think most Freepers try to base their understanding on reality.
From your response to my hypothetical question, I can only assume that you want to confine pre-contact video viewing to cases where the videos depict murders. The same question arises, what happens if the guy goes on a rampage while you’re back at the station viewing videos? I presume your answer would be “well they should have known that this was one where they should go see him before viewing videos”.
So based on a 10-minute chat, this case went from “so important that we don’t have time to look at a video” to “all cleared up with no need to bother with looking at anything at all”?