The characters in Prometheus were each in their own way stupid. They grew more and more stupid with each scene. I had to leave after an hour, not because I was scared, and certainly not because the big ideas troubled me, but because I could no longer keep from laughing at all the stupidity on screen.*
People that stupid could never achieve space travel. They would kill themselves doing the math.
*There was one exception – the captain of the Prometheus was not exceedingly stupid. He was just a cliché. It would have helped if they had taken away his cigar.