I don't this this should necessarily be a rule. This is more in the nature of guidelines or HowTos. I agree there are many cases where a mod should be able to deal with issues which arise.

My previous post was probably badly worded in that I just mean mods are human and it may be politic to bring in a mod or admin who has not been involved in the thread in cases where they are. Particularly when it involves a dispute between members. This is as much to protect the mod from accusations of misuse of power or bias.