Because Uncle B has never seen iodized salt.

Shoot, I thought it was all iodized. This is so people who grew up a thousand miles from the sea like moi didn't grow up to be cretins or goiterous. Somewhere around here, I have an amazing photo sequence showing a child with cretinism over a period of some months during the administration of iodine. You can see him go normal.

The term cretin is derived from christianus — Christian. For etymological reasons that aren't nearly as fun as one hoped.