It will be curious to find out how BK first came across the victims, how much time he took to plan, what, if any, of his education he used in the planning he might have done, and to what extent he tried to cover his tracks. JMO.
A lot of folks didn't seem to think his education meant anything in regards to the crime, and that he probably wasn't very knowledgeable, even in the things he studied, or was hyper-focused on the girls. If that's the case, and he didn't take any steps to try to avoid the digital (or physical) footprints he was leaving (especially since digital evidence seemed particularly interesting to him, per his application to the Pullman PD), then I have my doubts he put much thought into crossing state lines, either. That's just a personal opinion, of course, and I think the real factor is how and why he targeted those victims or the house.
Actually, I tend to think he DID use his education to try to plan things perfectly, but he overestimated his own knowledge, or maybe better put, underestimated his own likelihood of messing up, in addition to LE's investigative skillfulness.
I just personally find it harder to believe that he took into consideration various state laws, DP, insanity pleas, etc., but then ignored the fact that he would be driving by probably dozens of cameras. JMO. Unless he had a death wish for himself, of course. You never know. But it doesn't seem that way considering him wearing gloves and sorting his trash into ziplock bags, after the fact.