Maybe not that they're necessarily dumb but just misinformed or don't take much of an interest in health issues as you and I do. Some have the attitude that you'll die one day of something so why bother. You can choose to ignore those people or simply tell them that it's your body and you can supplement the way you want. Maybe doctors do know about Iodine as I hear they use it alot in hospitals but they choose to prescribe something else. They're in it to make money too and some doctors fail to tell ppl about alternative methods because they are uncomfortable with ppl treating themselves as we sometimes overdo it.