I think the last paragraph is the "Trump might be playing 4D chess" argument. I find that implausible.
Well, it's more that I think his goal is to get rich, and that he's shooting from the hip on the president stuff. I'm not proposing there's any sophisticated planning.
My view is that Trump's behaviour is so odd that it raises warning flags, and that he should be subjected to an examination to see whether he is fit for office.
I totally agree. I think he's the most narcissistic person I've ever borne witness to. I think he's unstable. I think he's progressing dementia.
This doesn't make him medically diagnosable as specifically NPD, and secondly, it doesn't matter what I think medically, because I'm not qualified to diagnose.
Whilst I accept that clinical psychologists would not diagnose someone without an examination, criminal psychologists have to do something pretty akin to this, based on the evidence they have available, which would be far less than the evidence we have in the case of Trump.
Not sure what that distinction is... just as an example, my wife is an emergency intake psychiatrist. Patients come from whatever funnel they come through: some walk in voluntarily, some are brought in by the police. There's no special process for forensic patients.
If a patient refuses to participate in a structured interview, that alone is something they have interacted with the psychiatrist about, and then they are observed further, usually in isolation, but sometimes with other people (family, other patients) with an eye to what may constitute their casual behavior. There is always a direct observation and several attempts at interaction by the psychiatrist to justify diagnosis. It's especially critical if the occupation is reportable.
I asked my wife about BC reportable occupations, and she will come up with a list, but not sure if the information is on the web. These occupations have something called "reporting bodies." Examples from her recent memory are airline staff, police, military, medical doctors. The reporting bodies have a list of conditions they want reported, so not all professions want the same conditions reported. (which makes sense... airline pilots are probably allowed to have a toe infection unreported, but they want to hear about clinical depression due to suicide risk)