I believe David Paulides has a book out on hunters disappearing now too. I think in an interview he said bow hunters are a lot more likely to turn up missing than gun hunters. People out alone seem to be the most vulnerable.
A couple of videos here of things that can happen. The first one is of a park ranger turning loose a captured bear and it's a good thing he was packing a .357. The second one is of a hiker being stalked by a mountain lion.