I just finished watching it and I wonder that too. I wish they’d given a little more info about what happened to his mom, was that a suicide or a murder? His father seemed bizarrely unemotional, calling his son in to watch her jump instead of helping her or calling 911. Maybe his father was also a sociopath and passed it on to his son?
I’m not a professional psychologist but have stayed at the Holiday Inn and I think Durst might be a textbook sociopath. I don’t think he ever once referred to Kathie Durst as “my wife” or any other pet name that normal people use. He always referred to her by name as if she was a mere acquaintance. He also seemed to not care about her disappearance any more than if she was a sock lost behind the couch. Granted they’d been fighting a lot when she disappeared, most normal people would be full of all kinds of mixed emotions.
Same kind of thing with Susan Berman who was supposedly his best friend for many years.
Regarding the sandwich theft and asking to be interviewed, I felt it was a cat and mouse game. He was playing with “society”, thinking he was too smart to get caught and probably enjoying the exhilaration of seeing just how close he could come to revealing himself without getting caught. Of course he wasn’t in fact smarter than everybody else because even after getting caught talking to himself with a live microphone the time he was rehearsing an answer for Jarecki, he didn’t learn from that mistake and kept talking to himself in the bathroom with a live mic on.