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.
It is not a good idea to have hundreds of people on a mailing list intended for "confidential flow of information".
You do not publicize weak points, so that people can take advantage of them.
That is not only unprofessional. It is also irresponsible.
Wikipedia has been extremely open about its weak points from its very beginning. Many of us think that is a good thing. Security through obscurity may be a worse option in the long run.
Regards, Haukur