Yeah, kind of reminds me of the amalgam issue. If a dentist has been trained to believe mercury is safe in your mouth, he tends to believe that for a lifetime, well till he's on his deathbed or becomes crippled from the mercury himself anyway. At the end of their careers, they sometimes finally admit the truth, or rather, the lie.

Did you know the average lifespan of doctors/dentists is only mid-fifties or so?