(not specifically Yosemite, so posted under General Discussion forum)
How do you explain park deaths? You can't.
http://www.chicagotribune.com/features/columnists/ct-talk-brotman-yosemite-0725-20110725,0,2421265.column
....The boulder I sat on to admire the view turned out to be loose. It rolled, breaking my hip and pelvis. It trapped my leg and dragged me toward the edge of the canyon a few feet away. And it would have taken me over the edge if a skinny pinyon pine at the edge hadn't stopped it....
The cure for a fallacious argument is a better argument, not the suppression of ideas.
-- Carl Sagan