The fact that millions of people share the same vices does not make these vices virtues, the fact that they share so many errors does not make the errors to be truths, and the fact that millions of people share the same form of mental pathology does not make these people sane.
Perhaps it is better to be un-sane and happy, than sane and un-happy. But it is the best of all to be sane and happy. Whether our descendants can achieve that goal will be the greatest challenge of the future. Indeed, it may well decide whether we have any future.
also I know several aliens and most of them are not demons. they are fine upstanding citizens who contribute to society in several interesting and non controversial ways that blur the edge between sanity and the outer dimensions.
If the ability to tell right from wrong should have anything to do with the ability to think, then we must be able to "demand" its exercise in every sane person no matter how erudite or ignorant.