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this is generally correct, although one of the exceptions is Trump are narcissistic personality disorder, which many psychiatrists say they can reasonably assess through media, assuming Trump isn't merely playing a "character" every time he's in front of a camera or microphone

I'm sorry to beg more of your time, but at what point do we consider the persona taking over the personality. Trump may have started playing this character a long while ago, and it may be, if not ingrained, fully assimilated into the way he thinks and frames the world.

Just a thought, though.