What if Trump were to be found genuinely mentally unstable?

[politicat]

35. Technically, a personality disorder is considered an illness,

The same way that we treat an inborn metabolic disorder as an illness. Yes, that's normal for that person, but their normal is not population normal. A personality disorder is a fundamental flaw in that specific person's operating system, and it can't be fixed or modulated.

I am not making a distance diagnosis. The publicly observed behavior is consistent with the behaviors common to the Cluster B personality disorders. There is no known treatment or therapy for such disorders. Nor does a personality disorder in any way excuse a person from culpability for antisocial behavior. Persons in Cluster B are legally sane per the M'Naghten rule and its descendant variations. It's not a pass; persons in Cluster B are perfectly capable of living highly transactional but otherwise functional pro-social lives. When they don't do so, it is by choice.

The only reason to correlate the observed behavior to a known diagnostic code is to facilitate how we react to his/their behavior. There are interpersonal and social techniques that absolutely do not work with Cluster B people. They can't be reasoned with, their shame mechanisms are wildly miscalibrated, they don't fully consider us real, so cannot see why we object to dishonesty or manipulation. There are other techniques that are highly effective when dealing with B people, and fail utterly with everyone else. They're suckers for flattery, the more blatant, the better. They're often con-artists, but they're highly susceptible to getting conned themselves. They're walking Dunning-Krueger examples.