The vast majority of mankind think it to be real and they don’t think they are in nescience. Are you not too presumptuous ?
You misunderstand us, dear friend. According to the philosophy systematised by Shri Shankara, the world is a play of the intelligence of the Supreme Ruler and not a mad-house. The world is heaven, hidden under a fog of nescience.
When there is night over a hemisphere, does not everybody feel that he is in darkness? Every individual has an opportunity, based on his free-will, to know and be identified with the underlying reality—Brahman, Sat-Chit-Ananda—and enjoy unbroken freedom and delight.