There are those that use tactics instead of knowledge and clear communication to achieve the upper hand in debate and discussion.
There are those who resort to personal attacks to get their point across.
Beneath it all, that capacity is in all of us. While exerting self control is a good thing, often a person will feel less of themselves if they cannot express themselves. Even if it is unpleasant. You gotta get it out.
For that purpose, this forum has the Cage Match.
Is it easier to turn to a Moderator, the internet police force, to request the offensive poster be arrested in their activities? Is it easier to ban discussion? To Silence those that have too much voice for your ears?
It is a slippery slope. Once it is justified to silence, to ban, to bar discussion; once controls are enforced, it is too easy to justify taking even more. Taking more control. Taking more freedom.
A great deal of fluff can be ignored or if the poster wants, they can take it to Cage Match and tell 'em how they really feel.
Moderation should be janitorial, not police enforcement.