I think that “everyone should read the book” is a legitimate belief, because it implies the prediction that the benefits of reading the book are worthwhile.
It’s possible to believe that everyone should read a certain book because you are making predictions that reading the book will have certain consequences.
It’s also possible to believe that everyone should read a certain book without making clear predictions that open yourself up to experiences that falsify your beliefs that everyone should read this book.
It’s quite easy to adopt these kind of value signaling beliefs in a way that doesn’t make predictions.
It’s possible to believe that everyone should read a certain book because you are making predictions that reading the book will have certain consequences.
It’s also possible to believe that everyone should read a certain book without making clear predictions that open yourself up to experiences that falsify your beliefs that everyone should read this book.
It’s quite easy to adopt these kind of value signaling beliefs in a way that doesn’t make predictions.