My experience in seminary teaching in the '80s was that some of these guys simply resisted any type of theological, spiritual or pastoral challenge that did not fit into their childhood or adolescent stage of faith development, stunted perhaps at stage 3 of Fowler's schema: any conflicts with their beliefs were ignored due to fear or threat from inconsistencies. Conformity to authority was a premium, selective though that authority might have been. In short, they just hadn't grown up. Weeding them out of the system was not very effective. You could discourage them, dismiss them with lots of good counsel as to why they were being let go, but they just popped up somewhere else. A favorite tactic of theirs was to denounce former seminary faculty to their bishops as unorthodox teachers. Why? Because they could not bother themselves to try to get their heads around a little bit of Rahner, Schillebeeckx, Congar, Brown, Metz, Boff, Sobrino, or even the pastoral approach of Oscar Romero.