Well OK - let me see - he talked a lot (a world record 16 hour sermon is claimed), wrote compulsively, had weird ideas about sex and marriage and claimed extraordinary mystical experiences in which the writings, sayings and sex stuff were divinely revealed to him...diagnosis - delusional! Agreed or not?
In regards to the 16 hour sermon, I would look at the quality, not the quantity. Baha'u'llah revealed one his most important works, the Kitab-i-Iqan (over 200 pages) in less than three days. It is an exposition of the unity of religion.
The Kitáb-i-Íqán | Bahá’í Reference Library
You can read it yourself if you really want to consider His sanity. I've seen the writings of people that really insane so His writings don't appear to be those of a madman. Maybe He meets the criteria for another rare disorder you can find on the internet like Gerchwind's syndrome.
Baha'u'llah allegedly revealed over 100 volumes of works, either in His own writing or recorded by a secretary.
We don't know how much Jesus revealed but in the gospel of John it is written:
And there are also many other things which Jesus did, the which, if they should be written every one, I suppose that even the world itself could not contain the books that should be written. Amen
John 21:25
Baha'u'llah's three wives would look unusual from a Western perspective but was entirely consistent with his culture. Ultimately be brought a religion that prescribed monogamy, specifically a marriage between a man and a woman.
Jesus never married and was celibate. However King David had 24 wives, Moses 2 wives and we could go over quite a list of spiritually outstanding men in the OT who had many wives. Do they all have mental disorders or were immoral?
Baha'u'llah did claim His revelation was from God and His mission began when He was in the Siyah-Chal.
Síyáh-Chál - Wikipedia
However Jesus may have had a similar experience when he was baptised.
Matthew 3:13-17
Jesus appears to have had many mystical experiences including the transfiguration.
Matthew 17:1-8
Were they psychotic experiences? If so we should include Daniel and many of the OT prophets too.
Anyway, if Moon's record of prolific writing, mystical experience, atypical sexuality and circumstantiality (inability to get to the point despite talking for 16 hours) is evidence of narcissism and dishonesty, what is Baha'u'llah's prolific writing, mystical experiences, atypical sex and marriage ideas, and propensity for talking at great length evidence of?
You are thinking about tangential thinking where they never get to the point. It can be a symptom of mania. Circumstantiality, they do eventually get to the point, but usually well within 16 hours. Another word is being long winded so can be a typical characteristic of people that has nothing to do with mental illness.
Thought disorder - Wikipedia
What was atypical about Moon's sexuality?
I agree being convicted by the authorities is meaningless, unless we know why and what the evidence was. David Koresh would have been convicted if he had lived. Should he be consider innocent because Jesus was?
I don't think we have enough yet to get Moon, Baha'u'llah, or Jesus over the line in regards a psychiatric diagnosis. Its not looking quite so good for Moon admittedly but go on.