We watch all topics, and if they get nasty and hateful we moderate them. (obviously, some may slip by. That is why there is a report post to moderator link.) We all know that politics tend to go that way a lot quicker than a reef discussion therefore the closer scrutiny.
We will not delete a post just because the discussion gets a little heated, just if it becomes personal. People can hold differeing opinions without getting personal, that is all we ask.