They used to have similar problems with Dennis Kaufman, and other people who try to push a suspect, theory or book that is unproven and/or has not gained general acceptance or even a degree of mainstream media coverage.
This idea that enlisted man Rader could just hop on USAF flights from Japan to the US whenever he needed to is ludicrous! I was an enlisted man in the Army & Army Reserve. When we went to training out of state we flew commercial. That's why on so many commercial flights you will see a soldier, airman or sailor in uniform. I did hear from others about a few occasions when enlisted men would on an ad hoc, wait list, space available basis hitch a ride in the back of a cargo plane, if that plane was going where they needed to go. A very uncomfortable flight on a big slow plane, that might have to make other stops to deliver equipment before it gets to your location.
Rader would not even have had enough vacation time available, and even if he did, for leave he would have to pay to fly commercial. Maybe he could have hitched one cargo flight on a wait list space available basis, but it would be so long and time consuming there is just no way he would have the leave time to fly commercial or space available military to go back and forth from Japan to the US for the four confirmed Zodiac crimes, not to mention the several confirmed mailings, some of which took place weeks after the crimes. What utter nonsense.