I'm not the person you responded to but it does strike me that as opposed to BK (if guilty) not being a 'genius', *if* this crime was planned as much as many of us imagine, albeit it may have gone 'off piste', then BK weighed up the odds of advantages versus risks of taking his phone.
So, instead of doing what I would have done, ie leaving my phone on my bed watching videos, he consciously decided to take it and put in on airplane mode instead. We have evidence that he was aware of the forensic implications as it had been a part of his specialist study areas.
IMO an understanding of what he was thinking would be reached quicker if people imagine that he didn't do this in error, it wasn't an oversight or misunderstanding or an unconscious act, it was a risk / judgement call decisively made. But why?
Also, maybe it's possible BK knew that he cannot even get in and out of his area in his car without being tracked or visible on CCTV and NPR road cameras. So his main priority was to never fall under scrutiny whatsoever in the first place.
Perhaps his weak point was not being careless or 'stupid' but being over-confident that no one would ever suspect him? Maybe his self-perception was way off beam and he imagined people view him as holier than thou, an intellectual, an authoritarian, and very prim and proper?
Whereas in reality people saw him as a loner, odd, and creepy. Most people's ego would protect them from thinking that's how people feel about them. JMO MOO
