Pure nonsense. There are mental health experts that support Trump.
"Mental Health Experts" be they psychiatrist or psychologist, adopt theories and methods of treatment based upon those. One psychiatrist says talk therapy is the best treatment for depression, another says anti depressive relieving drugs are the best treatment. Some are known as Chemical psychiatrists, some use combinations of modalities. Psychologists ( my sister is one with a PhD) Use different ideas of talk therapy, based again upon theories. I would NEVER got to my sister as a therapist, though I love her.
My point, I couldn't care less what one of these people says, you can always find one with a different opinion. If used in court , The prosecution will have one as an expert who says the defendant isn't crazy and must stand trial, the defendant will have one who says he is as crazy as a s**t house rat and will never be sane enough to stand trial.
It is ALL opinion, just as your authors book is just opinion. Democrats will accept it as fact, Republicans will laugh at it as pure BS. It is all about political identity for most. .
There are some democrats for whom political philosophies exercise control over them. They mentally function in a reality where anything they see as contrary to truth in their reality, is a lie. Don't confuse them with facts, they aren't interested.
In the same way there are some that have voted Republican ( Trump got nominated because of crossover democrats, and people never interested in politics before) and some Republicans whose own reality is based on Trump. not as Jim Jones, but as a man who they believe finally gave them a voice, and who they trust implicitly. As a Republican, I criticize Trump, from his behavior to a foreign policy failure ( Syria). The Trumpites do not like this.
However, I will vote for Trump again, not by any control he has over me, but because of his accomplishments in office and his goals, with which I agree.
He acts in a way I never would act, and which I do not condone. But his shtick is from a self identified brawler, who thrives in chaos.
The alternative is too horrific to contemplate, a crazy Trump is 1000% better than a sane Warren, Sanders or Biden, any day.