Well, I can't really say that I have any well thought out, rehearsed answer to this matter, although I would tend to think that we will always have some who can discuss such things in a mild, considerate manner (to the larger degree) and some who cannot--as humans are perhaps simply that way.
As to discussions on Jref, I would appeal for an academical approach. In that mode of discussion, regardless of the positions (pro or con) on a specific, the aim is more so to open the issue up and look at it from all the angles possible, reason on the make-up of it, and draw conclusions--and the conclusions drawn do not necessarily have to been framed so as to sentence a fellow discusser or the specific topic/matter being discussed.
What I have reasoned out, is what I have reasoned out, and is where I stand at any moment. I may be very convinced of the reality of my understanding, yet would not expect, nor attempt to force, it on those with whom the discussion involves--in most cases. (there may be a few, extinuation circumstances allowing my to do so for a particular person, with the agreement of that person, as best I understand it to be agreed to.)
This is what I would call an 'academic' mode of discussion, and is what I have been trying to apply most of the time since I join Jref--and I am not perfect either. I'd hope to hear other voices here too; and more from the Mods or Admin.