My god, she’s been diagnosed with how many things just from people looking at her SM. The professionals will be out of work soon ! Lol.
It makes no sense to diagnose someone from a video. Even response to a dog barking is not an admission of guilt and can be sensory processing disorder, for example. Or something totally different.
Psychiatrists are not in agreement themselves, diagnostic-wise, a good example could be "schizoid personality disorder" vs "Asperger's" (I intentionally use old terminology) - both stay in DSM-V but the question remains whether they describe the same.
There are personality tests, there are neuropsychological tests, there are tests for autism, for mood disorder. CW will probably see a forensic psychiatrists and a psychologist. But as of today, we have very little information to diagnose him. Or SW, of course. I think we can talk about "traits" that we see but not disorders. We don't know enough.
Once upon a time, I read everything on the Columbine shooters, including the FBI report. (It is all published). The most shocking revelation was the discrepancy between their diaries (indicating serious mental issues) and visibly functional behavior. I think that even a trained doctor can miss a lot if the person is not honest.
In short, I think that today, we are better off mining for facts than trying to diagnose CW or SW.
But I wold say - CW was abnormal. Scott Peterson was abnormal, too. Because anyone who resorts to choices that 95% of people would not make is off by definition. At the same time, psychiatry might not not yet have the diagnosis for these people. Family annihilation is so much outside of human behavior.
(It would be interesting to run a therapy group for them, btw).