I have been reading this forum for many years and posting for two. I see a noticeable increase in deleted posts and the marked absence of many of the most helpful posters. I had disagreements with some of them, but their absence is my loss.
Why are you doing this? A forum can be moderated or not, but this forum seems in between and uses arbitrary rules.
Most of us take mind altering drugs; we need guidance sometimes when we are out of line, but threatening and banning are not helpful. This is a support forum for adults. Sometimes we are so overwhelmed by the drugs that we do not behave as adults, but that is rare.
If you apply arbitrary rules and let trolls post at will and you ban the people that complain about the trolls, you lose the respect of the forum members and you, medhelp, will lose in the end.
If you feel the forum has to be moderated, then supply a moderator that understands the forum and the problems of the participants.