Snipped a little and BBM.
ITA! I think that once he got in there that day, remembering that he'd already had two interviews, he knew that they were onto him, but he didn't know how much. And as his wife said, we know that he'd been behaving strangely. I think he was absolutely freaking out and I think he had been since the moment he killed Whitney. I wouldn't go so far as to say he's feeling remorse, because I'm not so sure he's able to step outside his own self-obsessed mind to truly feel bad for Whitney. I think he just feels bad for being a total screw-up... and he knows that he's taken his screwed-upness too far this time. He's really screwed. I think that it was probably a relief for him to just finally spill the beans to the cops... and also, he sort of had to. I mean, he'd previously made up this ridiculous story about being robbed at gunpoint by two mystery "black guys"... who supposedly stole all of his electronics (which he hadn't yet ditched). He knew the cops were going to find and search his electronics. He knew he was going to be busted for the kiddie *advertiser censored*, too. It was too stressful for him to keep up the charade, and once those floodgates opened, he couldn't very well keep things back. He's the epitome of pathetic.
Snipped for space... thank you for this post!
With what we know, and judging by his actions, he does not fit the criteria for the effect of mental disease or defect. That he understood the criminality of his actions is demonstrated by his driving out of town to commit the sodomy, that he murdered Whitney upon completing the sexual assault and in the process of kidnapping her, his hiding her body in a remote location and his tossing of evidence in numerous locations, i.e. he was attempting to hide his crime. The story he concocted to explain his whereabouts on that day...
and that he made himself a victim in his story further illustrates his knowledge of the criminality of his actions. ORS § 161.295 states:
(1) A person is guilty except for insanity if, as a result of mental disease or defect at the time of engaging in criminal conduct, the person lacks substantial capacity either to appreciate the criminality of the conduct or to conform the conduct to the requirements of law.
(2) As used in chapter 743, Oregon Laws 1971, the terms mental disease or defect do not include an abnormality manifested only by repeated criminal or otherwise antisocial conduct, nor do they include any abnormality constituting solely a personality disorder. [1971 c.743 §36; 1983 c.800 §1]
You really need to read the PDF. It contains answers to many of the things you are asking, and will clarify some of the things that you don't yet know and understand. I'm happy to attach it to another post if you need a copy.
In the PDF it states that he had a lot of electronics in his backpack upon his third interview with police. The rest they had to seize from his home. I am going on a hunch only, but I reckon they were in his backpack because he intended to dispose of them, just like he'd been disposing of lots of other things. I think he was worried that police may look through his car while he was in the interview, but I don't think he went into the interview knowing exactly what they knew and that he would for sure be arrested. So he wasn't worried enough to ditch the electronics before the interview... but he was worried enough to stash his gun, because if they found that in a search of his car or person, he knew that would raise their hinky-meter. Once he knew he was under arrest, I think one of the many reasons he began spilling the beans was because he knew they were going to find the kiddie *advertiser censored* anyway because they were going to find the computers. At that point, he knew he was screwed because he was caught in so many lies and inconsistencies.