How many believe a judgement or point of view simply because it comes from a professional or from someone endowed with intellectual or political (in its widest sense) authority?
If you are told that someone is a Doctor of Medicine for example do you immediately without checking believe what they say? A religious authority must be good?
Charles K. Hofling in 1966 conducted an experiment in simple heuristics based on authority, employing Dr. as the cue word, with almost calamitous results.