BeeBad, it is true, a board may be liable if they take no attempt to police a board of libelous language. However, it is not the person taking action against the libelous person that causes any action against a board.
It is the person making the libelous remarks that bring action against a board. So, you would be the guilty party, causing the action, if you produce the libelous assaults.
As stated in your post, you have assigned the cause to the wrong person. Make no libelous assaults, and you nor the board have anything to worry about.
I don't know if some of the readers realize this fact, but I have seen many libelous statements against Clough, Braine, and Gailey on this board. If these people were to pursue action against the perpetrators, I believe they have a lot of material to use from posters on this board.
BeeStorm's warning, in another post, is warranted. He stated for you to take it private if you intend to slander someone. If you send someone a private Email with libelous assaults, you relieve the board of any responsibility, but you still do not relieve yourself of that liability.
Father Time