It is, of course, not any kind of substitute for critical thought. But the GP referenced dialectic by way of arguing for contrary materials to be presented in

It is, of course, not any kind of substitute for critical thought. But the GP referenced dialectic by way of arguing for contrary materials to be presented in class: my point was that a living argument among the students is better for teaching dialectic than a curated selection of contrary views. The responsibility of the instructor goes beyond this elementary requirement for ensuring multiple viewpoints are presented.