Many were local Indians who were dirt poor with no cars and hitchhiking is the norm. The towns are very small with no stores, doctors etc etc.
.Outside mag was not downplaying the problem and they never said all were aquintances but many were found later to be. Lot of it was drug related.....
.The author pointed out the signs everywhere warning the young girls and he witnessed a young girl getting into pickup right next to the sign one night.
So the truth is probably that there is likely a serial killer operating in the area, but he’s not responsible for all forty of the victims found in the area.