Sure is food for thought.
I don't see "insanity" when watching that perp walk I think she looks more like she has Parkinson's disease or some kind of rigidity condition. Her motor skills seem off, she seemed to be having a difficult time just walking, her posture was strange.. her whole body looked to be full of tremors.
anyway jm:twocents:
Thank you for sharing your experience of what mental illness is like and how you think it relates to this crime.
The kind of psychosis here, if any, is indeed of a different nature than that of Yates. Clearly she was not thinking in normal fashion about solutions to life's difficulties, but her disordered thinking is apparently on a different level.
That said, the physical illness (resulting from whatever natural or self-inflicted cause) you and I both suspect may be associated (as with Parkinson's) with altered cognition, and changes in impulse control, with increased agitation, irritability, and/or aggression.
That is, the tools our brain possesses to dampen emotion and reaction are busted - perceptions are impaired, and emotions abnormally intense or absent. Parkinson's, which you mentioned, can by itself or as result of medication cause very serious cognitive and emotional problems and unusual impulses and aggression.
The TD symptoms or extrapyrimidal symptoms are intriguing because they point to organic brain damage and use of substances that can damage the brain in other ways - producing an "emotional dyskinesia", ie. malfunctioning related to the disease affecting perception and mood.
One could analogize it to two cars, "healthy car" and "beater car" at the top of a hill getting pushed from behind. The conscious driver in the healthy car knows ways to slow and control the descent. There are checks on the movement of the car. Putting the car into a new gear, or applying brakes, or the emergency brake prevent a dangerous race downhill.
The driver of the beater car may be impaired or confused an make mistakes trying to deal with the crash. The brakes aren't working as they should and aren't going to. The driver may have a stuck accelerator, even. This roll downhill is nearly unstoppable.
Facing this loss of control, the driver might even choose to hasten the crash, thinking, I hate this car, I hate my passengers laughing at my car; this is impossible to bear. I am going to roll it down hill and crash in that wall and that will end my humiliation. Plus that husband who was too rough with this car can enjoy watching the consequences. See what he did to us?
I may despair, but I control my fate!