The closest thing an anarchist would ever advocate for in regards to an internal peacekeeping force would be some sort of community defense to defend against violent threats to community. But there would be ways to prevent it from becoming centralized and abusive. One way is by training everyone in the community in community defense and rotating the role. Their are other ways as well. But besides the point
As others have said, I think its important to include some level of accountability for moderators. Ways for the users to identify when a moderator is abusing their responsibilities and clear, fair, and accessible process for users to remove them from those responsibilities in a case of consistent abuse.