From the above link:
“Mary Ellen O’Toole, a former FBI profiler and director of forensic sciences at George Mason University, told Fox News that kidnapping Tibbetts “would be a hard feat to pull off.”
“To have a complete stranger to come into a small town like this, someone would have come forward and mentioned that they’ve seen this person,” O’Toole said. “She either got into the car of someone she knew or had a relationship with, or it was someone who had a non-threatening demeanor.”“
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My opinion on the above quote, as she obviously has more qualifications under her belt than I do LOL, but my opiiiinion is that a random abduction might not be as difficult as one thinks. All it takes is a few seconds/minutes and in a rural setting there’s a very good chance nobody saw anything. Even in highly populated areas people see nothing, as with the case of Jessica R. And if Mollie had her earbuds in, and/or was tased, threatened at gunpoint...JW (Jessica H’s abductor) had a syringe...
It is very likely that Anby’s and Libby’s killer DID “come into a small town like this...”, hence the billboards and nationwide appeals.
Of course stats tell us that it is more likely for a victim to know his/her perp; however, if the motive is SA I still think a RA is on the table.
Additionally we see perps travel to commit their crimes, or they are in the area for a reason, work, etc.