Yep, and we won’t be able to ask them, for the most part. If there was someone out there tinkering with their gray matter beforehand, they aren’t talking about it either.
Why not assume alien mind control chips shoved up their butts?
Or rare spider bites introduced by local voodoo priestesses working the drive throughs at Wendy's?
Or perhaps these folks are just execptionally vulnerable to backwards, upside down visual messages of nano-second duration in Sesame Street counting lessions...