Do we trust engineers "too much"? Depends on your perspective.
The cars we drive are made by engineers as well. The failure rates on those is actually pretty high -- how many recalls have we had in the past year?
Yet people get in cars every day and think nothing of it. And when you're driving, you're not only trusting the trained engineers who designed the cars, but you're also trusting the other drivers to not plow into you willy-nilly, you're trusting who knows what condition of cars facing you on the roads, and so on.
In the face of that, the "trust" implied in getting on a roller coaster, where the rides go through tons of design reviews and testing, pales in comparison.
Or, to look at it another way. I'm a diabetic. I wear an insulin pump. This is a small computer that automatically supplies me with insulin on a regular basis. Great, no shots! BUT, improper dosages of insulin (over or under) can be fatal, VERY quickly. My life is in the hands of the hardware and software engineers who designed this thing. When I first got the pump, my fellow software and hardware engineer friends thought I was INSANE to do so, because ALL software has bugs (as one of them put it -- "You WRITE code for a living and you STILL trust it?!" ;-)
6 years later, I'm on my 2nd insulin pump (warranty ran out on the first) and loving it. Again, the risk of riding a coaster is less than the risk associated with the pump. Big deal.
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--Greg
http://www.pobox.com/~gregleg/