Actually, I was thinking that part of the problem was that there's a skewed idea of what "average" actually is. For example: based on NASA studies, the human body can safely take 2G's for an extended peroid (which is about what the shuttle accellerates at). Ergo, perhaps the designers follow that "conventional wisdom" in designing rides, since it's "common knowledge" that a person can safely take 2G's...forgetting, of course, that the number's based on your average trained astronauts, not Ma and Pa Kettle from East Bum!@#$, Iowa.
Plus...I wasn't talking about death, I was talking about intolerance (which includes death, obviously...but is not limited to it). This particular ride apparently has a history of making plenty of people ill. Sever, protracted motion sickness is also a sign of going beyond one's tolerance. If it's as widespread as it's being reported, the ride may very well be beyond the average person's tolerance.