Being informed is a personal responsibility. Unfortunately, many people "do not read the fine print". But Jehovah's Witnesses are still a voluntary association.
Children raised as Witnesses are free to leave when they become of age. Many do, and many leave before they are of age. That someone was baptized as a youth does not bind them to the association for life. My grandmother converted from Catholicism to Jehovah's Witnesses when my mom was still fairly young. My mom attended meetings with her because in the Austrian/German culture in which she was raised the belief was that you honored your parents that way. Mom was not persuaded or converted, and though she had a Bible based faith it wasn't the Witness faith. When she was of age, she stopped attending. I attend with relatives on occasion. The Witness faith is unconvincing. Being dragged along by friends, relatives or near family does not change the fact that religious association is in Western lands, voluntary association.
Dr. Introvigne's interest in Vampire mythology is academic, not Satanist. Engaging in ad hominem does not refute an argument. You may disagree with his approach, but he isn't a 'cult apologist' but a rational academic who, like most academics in his field, rejects the descriptors 'cult' and 'sect.' If you listen to his conference presentations, you would not find him to be a cult apologist. Not buying into the anti-cult movement with all its misrepresentations does not make him an apologist. He is a Catholic.