The only things I think would "repair the community" are shutting this board down and making a new one or making it private. (The second option is probably not all that helpful though since it would just create an echo chamber.)
I was part of a game community that imploded on itself much like this one has, and it just kept getting worse and worse until everyone stopped logging in and the headwiz decided finally to shut the game down. There was nothing else that could have been done to fix the game except banning nearly all of the active players since everyone was in the wrong and disobeying the rules. Banning everyone wouldn't have really fixed anything in our case except to make everyone left too scared to participate. The headwiz and the rest of staff stepping down might have helped, but then there would have been a lot of power grabbing drama. In the end, ultimately half of the community would have felt unfairly treated. So shutting down, which forced us all to move on, was probably the better outcome.
As a long time lurker, I mostly read posts here at MSB to know when bad actors were in the community so I could avoid them and also to gain insight on developing and running MUs. Seeing the community split apart has made me really sad, but I'm glad to know that BMD is carrying the torch forward on calling out injustice in this hobby. If MSB is going to stick around, I hope those left will find what they can best contribute to the conversation. Like how mentioning WORA still opens wounds in people however, MSB will have a similar effect for those who were involved for a long time.