[Milawe]

Sometimes when moderating a forum, you end up removing posts that simply address the offending posts because then they stand alone kind of just dangling in space. That can jar the discussion as well.

Usually, from what I've seen, moderators will simply moderate because it is quick and easy to do before the thead is killed by flames or a tangent. If it's JUST a tangent, then moderators will often split the thread. Some forums will squash flame wars because they feel it contributes to a negative image on their site. People who are repeat offenders usually get moderated for a while, and then they start getting warnings via PM or a temporary freeze on their account.

This is pretty standard for most forum communities. It prevents posters from being "driven" from the forums by others who are willing to engage in un-ending flame wars.