Is the will to discuss as voluntary as the will to learn? There are always a few students, the same ones, who are uninterested in group discussions. Maybe they are shy. Maybe they don't know peers around them well enough to dare to talk to. Their facial expressions are very ambiguous: they seem to me to show a mixture of embarrassment and dissatisfaction. A solitary, asocial person myself, I'm very sympathetic to those unrelating monads. I know this classroom situation is bad, but am not really willing to intervene it. So, here's a dilemma: my anarchistic self wants to leave them as they are, while my pedagogic persona is worried about their alienation that is partly self-willed but partly, probably, due to their unwanted inability/inexperience of socializing; if it's only a sign of discontent which they want me to notice, why not I do something to help them? But how can I know whether that's their true desire? Psychoanalysis would say that nobody knows one's own desire and need be told it by others, but I can't be confident or arrogant enough to claim that I'm such an other who knows "their" desires.
