Authors who were clearly deranged lunatics

I don't know if "deranged lunatic" means anything specific but, the only writers I know of who I would call seriously delusional were Ezra Pound (Cantos), Frederich Nietzche (Beyond Good and Evil) and Antonin Artaud (The Theatre and Its Double). In my mind Ayn Rand was far from delusional and I don't just say that from reading her books but also from having seen her on talk shows answering questions and explaining her philosophy.