"Some men are alive simply because it is against the law to kill them." - Edward W. Howe
because if they were not stupid, then we would have to think about the questions, and when the brain has to think most of the time, then we would end up insane... or to put it simple: so that they are easy to answer
why was my answer so long?
"The darkest souls are not those which choose to exist within the hell of the abyss...
...but those which choose to break free from the abyss and move silently among us." - Dr. Samuel Loomis