Like Nietschze; I mean the official theory ist that he contracted syfilis as a young man and therefore later in his life ended up in an insane asylum; which of course was fathomable and apparently happend a lot in the end of the 19th century. I for myself kinda choose to stick to the theory that he just couldn’t take the world view he created for himself anymore and the ignorance of the vast majority, so that he also had something like a ‘nervous breakdown’ that landed him in such a place. But well, I guess that’s just trivia or the ramblings of another mad man… 😜cheers