Hi, AK,
The use of the word assume or presume in your post is the key here. Some here have pointed out a common tendency to interpret clues or behavior to support ones previously-arrived-at conclusions about the case. Based on individual experiences with psychology, sad exposure to narcissistic parents, or other experiences which help define views, perhaps we all arrive at suppositions not solely on the basis of reason.
Heres a take from Lars-Erik Björklund, a neuroscientist, on something called tacit knowledge or disparagingly termed intuition.
A few years ago neuroscientists discovered that the human brain has dual systems for receiving and analyzing sensory impressions, one conscious and one unconscious. In the unconscious, that is the non-declarative system, our sensory impressions are compared with previously stored images. We all have an inner picture book of stored experiences based on what has happened to us previously in life. We also remember the outcome -¬ did it end well or badly? With the aid of these stored sensory impressions, we unconsciously assess the situation at hand and can predict the outcome. This capacity is especially helpful in complex and information-rich situations with a great deal of noise.
If one presumes a single outside perp, then the experiment from Simons and Chabris and the gorilla wont carry any significance. OTOH, if one interprets that 2 or 3 Rs were involved in the cause and/or concealment of JBs death, then the video message about attention becomes very interesting. (E.g., John Douglas focusing only on JR arrives at the conclusion he wasnt involved. Douglas then does not separately interview or consider Ms. West Virginia or her young son. Douglas conclusion is the Rs werent involved.)
Since I hadnt seen the Simons and Chabris video before, I had to try it. While I did witness the correct number of passes, I totally missed the man in the hairy suit. Its one of the reasons I continue to visit the forum, I keep thinking maybe I didnt see the guy in the hairy suit (something obvious), and it would point me to more understanding.
In a next post Ill provide something additional which will, for sure, be interpreted according to ones perspective. moo