We have administrators and moderators here but we as forum members has to be responsible on our own posts/replies. We do know what is right and wrong. We don't have to wait for them to say it.
We are not judging here. We just give out our views, opinions, comments on the given thread or replies or to posts we know that we have something to share on with.
I guess Sophie is referring to "let's play fair" here means we have to consider every angle on the given subject. If one keeps on messing with another person or being rude then we will know by ourselves if he/she is doing the right thing or not. So by being fair, we don't side with the rude, tactless posts...