It's interesting to take a step back and see when things really got off the rails. As far as I can tell, this general attitude developed in the early days of Rutherford's reign. He was in a power struggle and was fighting off massive defections. He chose to purge the ranks and increase the control the religion had over its members in an effort to solidify his hold on power.
By the time the GB was formed in the early 70s, it was composed exclusively of men who had served under Rutherford and had adopted his view. Most revealing is a quote from Crisis of Conscience where Ray Franz quotes from GB meetings where the prevailing thought was that "brothers couldn't be allowed to decide" on various issues lest it lead to a complete collapse of morality (or something like that, it's been a few years since I read it).
What you have today is a group of men who came up under the tutelage of a group of men who learned from Rutherford. The groudwork was laid nearly 100 years ago and Rutherford's choices continue to impact millions till this very day.