"Psychotic" is rooted in his belief that he was right and would prevail.
Heavens. Imagine that, folks. If you believe you're right about something, even though others say you're wrong, and that you will prevail in the long run, you are psychotic. There 'tis, in black and white. That would seem to indicate there have been maaaaaaany psychotics in our nation's and the world's history. Doubtless of course, there have been.
Some might say that calling another person psychotic with no medical evidence could be interpreted as, "You don't think the way I do, dammit! Therefore I shall call you names and hope that others believe it!"
I, however, would never do so. It could be considered slander. And at all costs, we certainly don't want to have that on this board.