In one of the best Chronicle Review pieces I have read in a long time, Professor John Swallow argues in favor of a simple (but often forgotten) principle: "A necessary part of making an argument is the investigation of potential opposition." (It's a subscribers only piece, sorry to say.) Bravo! Far too often, professors are happy to have students regurgitate the conclusions they like. As an example, today I came across a book entitled Organizing the Curriculum: Perspectives on Teaching the US Labor Movement. It's clear that the editors want educators to "teach the labor movement" in a way that makes students think well of unions, not by taking an academically detached look at the totality of costs and benefits.
Colleges so often talk about how they teach "critical thinking" to their students, but rarely do students hear an admonition to investigate potential opposition to their ideas. That's where critical thinking really begins.