Believe it or not, before the personal injury lawyers stalked the earth, we were a hearty race. Back in the day, it was assumed you had a head on your shoulders and could think. i.e. "if I want to work in a dangerous job - I should be careful." Now somewhere in the middle there should be a trade off of "I should have common sense not to stick my hand in a hot fire." and "How can we cut every corner to maximize the bottom line and the hell with whether or not an employee loses an arm in the process."
I don't know if we'll ever find it.
(Video is 22 seconds long -- Taken at the Wichita Museum of Transportation.)