| | "Can anyone name any 'school' of thought that has not fallen into this trap in some way?"
To the contrary, Psychology fits that description to 'T' - There are Behaviorists, Freudians, Jungians, etc. (about 400 different schools each with at least one significant idea they have organized around).
But I would say that quote only captures half of the dynamic... the negative side of that process - at least the way it is in Psychology.
First there is an innovator, say Freud, who advances or begins a science or discipline or a brand new area in an existing discipline. Students and practitioners who see value in that innovation come together to form the new school and they expand on the new principles, and work out the applications, explore the corollaries, and offer corrections and improvements. All good stuff (assuming there is some worth in the basic innovation to start with). Competition between ideas arise when another school arises with conflicting views, and this can be good as well, as long as there is a reality-based standard that will eventually resolve differences in favor of the best ideas.
There will arise, from the disciples perhaps, someone who breaks off from the school and forms his own school (like Jung did when he broke with the Freudians). This branching is a process by which we evolve a tree structure of knowledge/theory and gives us more alternatives to compare one, against the other, to find the best fit to reality (or to provide more food for thought).
I don't think we see these values as clearly - they should be valuable parts of the process of a "school" of thought and of its disciples. Maybe, in part, this is because of the government's involvement in both our educational system and in the world of research. That involvement makes for an unfair, and out of balance system such that competition is skewed in favor of the tactic of exclusion, ridicule, etc., as tactics by those who happen to constitute the main-stream. Kind of like king of the hill, where if you get on top, the winning strategy is to push down anyone who is getting close to the top - before they are on equal footing, as opposed to level-ground, free market competition which impels people to attract customers/adherents by offering value/intelligibility.
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