The hunt for Bin Laden's body
Most horror movies completely ignore this fact, because a big monster with over-the-top special effects is an easier way to put some drama in the movie. There have been a few movies, though, that tell it like it is. One is “The Blair Witch Project,” of course- for most of the movie, the only evidence of a witch is some spooky noises in the background.
Another example is “The Haunting”- not the ridiculous remake they made in the Nineties, but the old black and white version based on Shirley Jackson's superior horror novel “The Haunting of Hill House.” A team of ghost hunters stay in a cursed mansion, and nothing much happens- except that one of them starts to slowly lose her mind. Because that's the curse. Hill House somehow gets inside the head of any visitor with psychological issues and slowly drives that person over the edge, but it's all very subtle, very ambiguous. Even at the end, there's no way to say for sure that the house had anything to do with it.
In my opinion, that's what real hauntings are like, and that's why they don't “prove” all that easily. Horror movies that recognize this can get a lot of mileage out of it.
What he did was to go back to the original sources and establish two things:
1- Some of the 19th century Jersey Devil legends were fabricated in order to discredit a local politician. Of course, an existing local legend could well have been hijacked for such a purpose, so this doesn't really debunk the Jersey Devil as such. However, it does prove that the commonly-given “origin story” for the creature could not have happened.
2- in 1909, when many of the famous sightings occurred, some prankster attached fake wings to a kangaroo and charged admission to see the Jersey Devil. However, as the author admits himself, there is no clear indication whether this happened before or after the sightings, so it could have just been a case of someone trying to cash in on the public interest in the creature after legitimate sightings had occurred.
He ends up concluding, quite sensibly, that any number of things could potentially explain the sightings and that we don't know what really happened, but that there is “no compelling reason” to assume there's a Jersey Devil out there in the Pine Barrens. I can't really say I have any problem with that conclusion, but it falls rather short of a debunking. It comes down to a difference of temperament. When confronted with such a legend, his inclination is to disbelieve without definitive proof. Others are inclined to believe whether they have proof or not. My inclination is to say “maybe” and to enjoy the legend!