1. Really obvious hallucination
2. Urban legend
3. Renowned as terrible investigation
4. Likely kidnapping and/or death and concealing
5. Also terrible investigation
Bleh. I always get a bad taste in my mouth with these disappearances, because they're so easily written off as spooky "unexplainable" things that happened a long time ago and become relegated to people obsessed with the paranormal. Witnesses and testimonies are unreliable, things that people don't understand are misinterpreted, stories change, things get made up, investigations fail and somehow they just eventually get touted as unexplained phenomena. Then wow, if you only read the story that gives you minimal and possibly incorrect information, you won't be able to explain what happened? No kidding. Doesn't make it strange, it's just that nobody has all of the information about what actually happened, and you probably won't ever be able to get it.