Crothain hit upon the most important reason that discussions go south... "What people type is read as being rude... "
Alot of the inflamatory posts result from someone misreading a post and assuming something that is not.
The rest of the inflamatory posts come from when the two sides are arguing completely different points and no-one notices
But, lets take an example... the OP..that way we don't derail into other debates..
Your starting sentence
big dummy said:
Why is it that any time any discussion about D&D comes up which could even remotely somehow be construed as some kind of criticism of D&D as-is, a select few of the forum regulars swoop down with such venomous, vicious spiteful attacks to shut it down?
Check join date and post count of poster. The perception could easily be created that the poster has walked into the party, bumped into one non-freindly conversation, and decided to stereotype everyone at the party based on that one encounter.
Add to that potential perception a phrase that can appear to be a veiled insult to forum regulars
Result, about mid first page you have a mild flamewar with vieled insults on both sides of the discussion.
How can people avoid this.. well, it depends.
- If the flamewar is a fly-by poster who is just here to tweak you... ignore the poster and report them
- If the flamewar is someone actually attempting to debate, sit back and rethink your assumptions. Tactfully post a 'we are getting off track, lets recap what we are really talking about' and get about destroying the false perceptions and assumptions.
Both of these methods involve you, as the poster, taking a step back from your position to think that maybe your perceptions/assumptions are wrong.
Yes, EnWorld has some regulars that get a bit more, umm, aggressive and appear to get away with it. Why? More than likely because their posts were not reported. I know I have been involved in a couple threads that got over the line....waaay over the line
The thread did not get closed, nor did anyone get banned..but the thread also closed itself out with an agreement to disagree.
As DaveMage pointed out {while I was rereading this post for accuracy}, passion leads to emotional post content.
I do not beleive anyone is intentionally derailing a thread in order to get it killed. Its much easier to wait the couple hours it takes for the thread to drop off page one
I do beleive that taking the time to rethink your position and being aware that other folks should be able to disagree with you will go a long way to mitigating the issue you see.
So, to wrap it up, the inital post tends to set the tone. Think before you type..and re-read before hitting submit. Understand that this is the internet, so keep your flame-retardant sleepwear on just in case.
Don't take it personal.... {If need be, use a screen name that reminds you of that.. a practice I think both of us ascribe to

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