Discussion != Debate
Debate is when one side must ultimately win. So any point of disagreement is a form of attack. Such attacks must be vehemently defended, because you're trying to in the debate.
Discussion is when everyone participates on somewhat equal footing, even when they disagree. Points of difference aren't necessarily attacks; they're just points of difference. And to make a point of difference doesn't imply that the other side is wrong - only that you disagree with it.
This is a DISCUSSION.