I fully agree with you that all those stories are stupid. I also believe that many are made up. Do you notice that they are never told in first person? An in the decades I was a JW hearing all those stupid stories, never, not once I heard of anyone knowing any of the people involved. It always happens in some distant place away from where people listening to the story are.
Anyway, the one thing that I'd say, though, is that although I'm not an expert in the matter, I believe that gullible is not what I'd use to describe people who love hearing those stories or people who join the WT and other organizations that harm them. I think that any person at any level of intelligence can fall in the hands of the WT. Just my opinion. I can't tell by my own experience since I was born in.