Forums are very hard to moderate, and it's a rotten job really, as who is to say what is right and wrong (except the obvious). They all need interesting content to survive, just go look around and you will see hundreds of dead ones which didn’t manage it.
Not accounting for the outright idiots, often the line between moral, humorous, interesting and offensive is very thin and calls for some tough and soul searching decisions which invariably upsets someone.
Humour is extremely important as it is the one subject that allows personalities to be expressed freely and breaks down the social barriers amongst other things, (so lets not lose it)
However even this has issues as it depends on peoples concept of humour which is as individual as we are.
The most common issue to cause trouble is a "wind up" great so ban all "wind ups" that’s easy. Well it would be but what is a wind up? if we could define that the rules would be easy to follow.
However most posters know when they are pushing it or wrecking topics and so does everybody else, so I guess there is no big suprise when posts get pulled.