Truly a scary report, Ranger Steve. I knew two people who were killed rappelling, and they were very capable, experienced climbers. And I’ve experienced a few times when the last person down had to rappel off a dodgy anchor without a belay. Once it was me.
The problem with rappelling, like glissading, is that it is too easy and too fun. Both are methods of descent that should be treated with great respect, and some fear.