Sometimes the two are linked. I had two JWs come to my house once. It had been a while, since most of them had learned I was a "hopeless" case, but this guy was pretty high up - gave speeches at their conventions, etc, and probably felt confident. I stood in the doorway and prevented them from coming in, but we did get into a discussion about Biblical things. For everything he mentioned, I had answers and returned questions for him. He was losing ground and grew increasingly frustrated. Finally he broke it off, saying that we should do it again some time, but sitting down and consulting the Bible. I said we had consulted the Bible, just not physically - since both of us, but me more than he, had the verses down to memory. He turned and abruptly walked off, barely disguising his frustration and anger. But the guy with him, who was a neophyte just learning the ropes, stepped forward and with a big smile shook my hand. I'm sure it was eye-opening to him that one can be Biblically informed and not agree with JW doctrine. I never saw another JW at that house.