Do you follow the painstaking and detailed work of retired police officer Dave Paulides on his Canam Missing Project YouTube channel? He offers no theories, conspiracy or otherwise, but factually presents thousands of fascinating unexplained case histories of missing persons, mainly from US National Parks.
David Paulides, the creator of the organisation "NABS" the "North American Bigfoot Search"? The same David Paulides who has published two books and numerous blog and postcast entries about Bigfoot, and another seven books about how there's a vast government conspiracy that goes "beyond the known world" linking all the missing people?
The whole "people going missing in national parks" conspiracy theory is a prime example of something with a perfectly logical explanation being pushed to the limits of rationality.
There are 63 National Parks in the USA, comprising hundreds of thousands of square miles of some of the roughest and more desolate terrain. spread out across an entire country. Collectively they receive 330 million visitors per year, and a hell of a lot of those 330 million are not experienced outdoorsmen and women. The number of people who have gone missing while inside one of the 63 parks across the US is not an excessive number, considering the vast geographic area involved. Remote wilderness is dangerous. You have to know what you're doing and be prepared, and many people simply are not.
One of Paulides' pet "mysterious disappearances" was actually solved years later. The missing guy's body was found in a pile of rocks and boulders, at the base of the cliff path he'd been running on when he vanished. He was less than 2 miles from the last spot he was sighted. He'd simply fallen off the cliff and his body had landed in an inaccessible spot where he couldn't be seen from the path.
Occam's Razor: most people who vanish in remote wilderness either got lost and died from exposure, had an accident like falling over a cliff or into a river, possibly some are animal attacks, probably some are suicides. Maybe some are murders but individual murders (guy convinces his wife to go camping somewhere remote, pushes her into a ravine, reports her missing, collects the life insurance and marries young mistress) not killings that are part of something bigger.
I love reading these stories too - I live on Unresolved Mysteries. But to me the human psychological need to see connections and to want random horrible things to all be part of a master plan is far more interesting than killer Bigfoot.