After some journalists garnered a quote from a psychiatrist saying he might be insane, he sued for libel. There is now the "Goldwater Principle", that you should not speculate about someone's mental health from a distance.
"I would remind you that extremism in the defense of liberty is no
vice! And let me remind you also that moderation in the pursuit of
justice is no virtue!" - Acceptance speech to the Republican National
Convention, 1964.
