[user104658]

Originally Posted by Livia

You call it lack of education and understanding of the conditions at altitude, I call it stupidity.

I suppose. Though 500 years ago, people far smarter than you or I wouldn't have had any idea what conditions are like at 30,000 feet . It's just lack of general knowledge which doesn't really say anything about intelligence IMO. Some of the smartest people I know are severely lacking in some areas of what seems like really basic knowledge.