I cannot even put myself there. I have no clue what it would look like if I was accidentally responsible for the death of my child. I doubt anyone truly knows if they would be raving mad or calm and catatonic or anywhere in between.
But something apparently seemed off to responders and witnesses alike based on interviews and statements from multiple people on the scene first.
That alone is highly subjective. Taken alone it is nothing MOO. Taken in with all the other little pieces to the puzzle and at the very least you have someone who accidentally and negligently was responsible for the death of their child and then tried to figure out how to not look like crap when they figured it out midday. Just My Own.
What if what he took out to the car was so stupid and inconsequential that LE knew it was a ruse, a reason to step out to his car or be heading to his car to see what was going on with Cooper. Maybe the lunch visit to car to put "something" in it was because he had just figured out he had left cooper in the car?
IMO the sequence of events then becomes very important because rather than jump up and scream to coworkers OMG! I think I left the baby in the car!!!!
What if, the alleged computer search happened just before the car visit? What if he hesitated to try to figure out what he was about to find a dead or living child?
That means even if an accident, he went into CYA mode IMO.
I've read every page of these threads and your scenario is the one that makes the most sense to me of all. I truly believe the child was left in the car accidentally but the dad remembered - probably too late - and his concern for appearances and self-preservation overrode his parental instinct to run screaming to the car as most would in that instance regardless if they already knew it would be in a futile effort to save the child. I just think he's one of those people who can and do love others but will always love themselves more and would rather concoct excuses for even the purest of accidents rather than admit to have been in any way at fault. This would have helped him remain detached enough to google and then try and come up with some plausible excuse that wouldn't reflect too badly on him. He bungled it by the visit to the car and his inability to keep his story consistent when he finally did report it IMO. Obviously this doesn't make the dad a particularly nice person, actually it makes him to me more than a little despicable, and he clearly deserves to pay whatever penalty is appropriate for his negligence, but it doesn't make this a premeditated murder either.