So can people with knives or swords, or baseballs propelled by a bat. Anyway, I suspect that all of those quadcopter injuries occurred while the owner was setting up the quadcopter. Every story I've read (mostly from my frequent visits to RC hobby forums) is from people attempting to test functionality on a bench with the propellers on, or perhaps a few people who attempt to take off with their aircraft right at their feet. The RC helicopter death is a valid point, but that's the only RC aircraft related death I know of, and helis like his pretty much self-regulate because they're expensive, require mechanical knowledge to setup and maintain, and will mostly likely never get off the ground if flown by someone who doesn't know what they're doing.