From a review of a book about the mental state of the Nuremberg defendants:
Dimsdale cherry-picks his examples to cater to our idea that human evil must have something to do with psychopathology. But the verdict goes in the other direction: The overwhelming majority of the Nuremberg defendants did not possess the traits of the mentally diseased. Their Rorschach tests were normal. Yet one of their examiners, the psychologist Gustave Gilbert, still labeled them insane. Gilbert, the Jewish son of emigrés from Austria, described the Nazi defendants as “narcissistic psychopaths whose lives were deformed by a diseased German culture.” This made them more rather than less culpable in Gilbert’s view: “to him [they were] the devil incarnate,” Dimsdale writes.
The other examiner, Douglas Kelley, disagreed with Gilbert. He thought that the Nazis displayed “profound moral failing” rather than mental illness. In spite of his disapproval, Kelley seems to have bonded with Göring and a few of the others. Bizarrely, the emotionally troubled Kelley, who was a professional magician as well as a psychiatrist, committed suicide 12 years after Nuremberg. In his living room, in front of his wife, parents, and children, he swallowed a cyanide pill, the same method that Göring had used.