I can't say for sure, of course, but I wonder if Travis felt about JA like I did about my best friend-psychopath who eventually committed a horrible crime against me. I would go through, say, a day where I added things up and really wondered about her. I had serious, huge misgivings about her. Then the rest of the following days were just so normal and she was so charming that I felt silly for taking her flaws so seriously. It must have been an overactive imagination on my part, see
I bet he felt silly for fearing JA when she was in front of him with her smile and giggles, etc. You don't get taken in by a psychopath without finding them believable or charming. I bet Travis could not wrap his head around how bad she was, even as he himself voiced concern on occasion. I did that. I almost still don't believe how bad mine was. It's surreal to try to reconcile the awful with the good parts you like[d] about the person.
I have little doubt JA showed up with the most convincing, amazing con we could imagine. And apparently (imho) she seemed really sincere and credible. I could see that. You'd have to know a psychopath like that, maybe. I would have sworn on a stack of Bibles that mine was really harmless about violence and that sort of thing. She's really a monster. It's mind-blowing, seriously.