Yes. I learned something new about their deceitfulness, reading this thread. I'll check out the website you posted, too.
So far, I have found a couple of extremely destructive theories of the Jehovah's Witnesses: refusing blood transfusions and disfellowshipping/shunning.
In my opinion, the worst of their deceptions, so far, is their writing/quoting on the blood issue.
Attorney Kerry Louderback-Wood has written a long, but very insightful article about that. She exposes many, many of the Society's misrepresentations, (of medical and academic material), used to support their cultic beliefs about refusing blood transfusions. The article is entitled "Jehovah's Witnesses, Blood Transfusions And The Tort Of Misrepresentation," originally published in The Journal Of Church And State, last year. It can be viewed at the AJWRB site, here:
A great deal of the criticism is directed at the Blood Booklet, but also includes some references to other articles and literature regarding the blood/transfusion issue.
It is well worth one's time and trouble to read the entire article (and to share it with medical professionals with whom you are acquainted).