Guru? What Guru?

I am a sceptic, through and through. Management is a science. It is a frequent sentence written in text books on Management. If it goes by scientific methods, that is. It is also an art. Another frequent sentence written in text books on Management. It is an art when there is no definitive approach to managing. And then there are the "Gurus", supposedly wise teachers who write books on Management. So called, because what is written can hardly be derived from scientific methods. Normally, it comes under the "Art" section. Good reading with case studies. For as long as there are people managing, there will always be different styles of effective management. I am a sceptic when it comes under Art section. I am a sceptic when authors I do not know well enough, seemingly write books and impose their ideas to the public. When I come across e-mails from colleagues of what a Management guru is saying, I view their words as nothing more than an advertorial. Advertisements, in the form of words, designed to bring the reader's interest and awe. There was one e-mail about a statement by this author that executives should not whine. Whining is an emotional complaint of a management action or procedure that does not make logical sense. Executives don't whine unless there is something wrong with the way the Management has done something or if there is an incomplete comprehension of the procedure due to an embargo on information. If executives don't whine, no grievance, then you don't need people to run the business. The author's statement does not make any sense. It is entirely ludicrous, to even expect that people should not whine. Unless of course, the author sees himself as a part of management. I wonder, how many authors out there, have the requisite experience to even write about management. As long as there are fools who cannot know the difference, there will always be a management author who will write nonsense.