Interesting theory. I posted an article here a few days ago where a criminologist said he didn't think the killings were planned based on their behavior, and that it was probably a robbery gone wrong or something like that and now they were fleeing in a panic. I think there is some evidence that points to that. For example if it was a planned killing spree, they could have taken out a lot more victims, especially during their cross-country trip, and they could have gotten away with it fairly easily. Also, they really didn't seem like they were having fun with any of this at all from witness descriptions. I know my husband said they were probably just idiots, but...a lot of killers are dumb and still get away with it. The Green River killer had an IQ of like 80 and he got away with it for decades, and that wasn't even as remote of an area. I think if it was planned, with how sloppy these two were, there would be some sign of it in their online and phone activity, like messages they sent to each other or something. If there's no evidence of that, then to me that indicates it most likely was a spur of the moment decision and maybe murder was not even the intended objective here.