I agree in that I don't expect either system to work, because of human nature. However, any argument based on empirical data is questioned based on the imperfect nature of the system that was being examined. I don't think there is any conceivable way to have a perfect system (and by corollary, accepting that argument would mean that we could never look at what has happened in reality, but would have to only look at theory. This, to me, seems silly and unacceptable.)

Again, in short, I'm presenting the arguments I've run across, and not claiming that I particularly agree with them :-)