Good responses here. I was giving this some more thought. The complaints procedure doesn't mention post deletion, but that is a powerful moderation tool, and it seems to be an outcome sometimes of complaints about posts. Earlier, I made the suggestion that posts should not be deleted by mods except in the most egregious cases. I'd like to amend that suggestion. How about if posts are never deleted by mods under any circumstances?
Personally, I like that idea for several reasons. One is that, for the most part, we can tell when a post is inappropriate or ill-advised. So if we know our crummy posts are going to continue to exist until we ourselves delete them, then hiri-ottapa comes more into play. This would make the board more of a Dhamma practice, where the effects of our bad kamma are visible to us, and we have to live with them until we choose to change our own kamma.
Another is that there's no way to "unsay" something that's been said, so post deletion by moderator action is a way of trying to change our reality. In real life, there's no moderator to come in and delete the bad things that happen to us. We have to live with them. I think this board would be more conducive to Dhamma practice if it more closely resembled reality in that way. Hearing the Dhamma, discussing the Dhamma and interacting with others is not going to be comfortable 100% of the time, and we're going to hear things we don't like. Part of Dhamma practice is dealing with that. Part of Dhamma practice also is dealing with our aversion to that, with our desire to make it go away. If a mod steps in and makes it go away for us, then we lose that opportunity for practice.
There will be times when a member gets way out of hand and become abusive. My suggestion would be: ban the member for violating the TOS if necessary, but let his or her abuse stand without deletion. Even foul language, slander, falsehoods, let them stand for all to see. That, in my opinion, would make this board a more effective place to really dig in and practice Dhamma.