For the great enemy of truth is very often not the lie ― deliberate, contrived, and dishonest ― but the myth ― persistent, persuasive, and unrealistic. Too often we hold fast to the clichés of our forebears. We subject all facts to a prefabricated set of interpretations. We enjoy the comfort of opinion without the discomfort of thought. ― John F. Kennedy
Take care when you hear any opinion not based on principles, for you are succumbing to those opinions produced by personal anecdotes - untested outside that personal experience - are the basis of myth. When those making those untested personal anecdotal conjectures vigorously criticize those asking for evidence, be more careful. For the smell comes from the propagation of the myth not the facts.