I had to link to another great and probing essay by Orson Scott Card, on how groupthink has made somewhat of a havoc of the sciences, particularly with regards to Physics and string theory. He also goes on about how this has affected other disciplines (namely the "Studies" departments, and even the English Departments), and how groupthink affects the culture at large. I really cannot decide what to excerpt, because it is all so good.
I do have to protest a bit though, as I think he was being a bit too hard on the English Departments. Don't get me wrong, I am well aware of the wholesale damage done by thirty years of rampant deconstructionism, postmodernism, Orientalism, multiculturalism, and the like, but the lit theory and comp. lit courses I took were solid. Most of my professors were great, and actually taught me things. None of them seems to be disciples of Theoretics. Exception to the rule, perhaps? Nevertheless, this trend is real, and it is dangerous.
It can be thwarted as well, as he points out.