Under no circumstances should the admin list have public archives. Period.
This list woudl be intended for the confidential flow of information, including, possibly, legal information, as well as strategies for dealing more effectively with trolls and vandals.
You do not go tell trolls and vandals how you plan on dealing with them, so they can figure out ways around it. You do not share strategies with rivals. You do not publicize weak points, so that people can take advantage of them.
That is not only unprofessional. It is also irresponsible.
People, get real.
Danny