Taking things with a grain of salt is the scientific way. That is healthy. Human history is full of scientific laws that lasted hundreds of years. Until one poor soul went through the lonely pain of trying to correct the common wisdom. The prestige of the person saying one thing has a lot of weight and gets accepted and repeated making it "truth". And vice versa. The lack of prestige of a person almost automatically discredits the merits of his/her ideas. Believe me. I am there.