It's kind of simple when one comes to that kind of conclusion, really. Personally, I believe that the fundamental flaw is the fact that such a high percentage of people is Iodine deficient...
Back in 2007, this forum discovered that over 90% of the population was Iodine deficient - over 90%!
When you add that together with:
everyone has cancer cells in their body
the thyroid is the main organ that needs iodine,
then one can easily do the math.
An iodine-deficient person can easily expect to get an OVER-proliferation of cancer cells in their body - the thyroid can become suspect immediately simply because of its high need for Iodine just to operate sufficiently.