I hear what you are saying. Too much Iodine can shut down the thyroid, but it is also prescribed in larger amounts by Allopathic doctors for pulmonary disease.
Iodine is necesssary for thyroid hormone production, but it should be used cautiously.
Turpentine is a source of Turpenes, just distilled pine trees really. This can be helpful for killing nasties in the gut. Why wouldn't this be less toxic than the synthetic anthelmintics?
Because it is used as a solvent? So is alcohol and so it water. Vitamin D3 is used as a rat poison.
As far as boron goes, I dont think that it is worse than lead. It has been shown to be an essential mineral for plants, and is ingested in milligram amounts in a decent diet. I think the toxicity scare was manufactured to sell more laundry detergent.
Disclosure: I don't make a dime promoting any substance. I have no financial interest on this site.
I think you should move to the Iodine forum, at least there you have a case. Boron is an essential trace mineral and there is no use trying to villianize it.