More than two dozen top psychiatrists, psychologists and other mental-health experts hope to provide some answers with a book due out this fall — “The Dangerous Case of Donald Trump.”

They don’t diagnose Trump, which ethically they can’t do without examining the patient. They do, however, discuss his symptoms, which lead them to conclude that Trump is a “complex, if dangerously mad, man.” They also propose that his mental illness is affecting the nation’s mental health as well.

These experts will likely learn what many journalists have discovered: Only the already convinced will read the book, and the rest will remain convinced of their certitude. The trouble is that when one is daily immersed in clouds of distraction, it’s difficult to recall what “normal” looks like.