I have a solutionary measurement. It doesn't seem at all possible, logical, or anything of a similar matter, but It just might work.
Step 1: Ban all crazy newbies.
Step 2: Quickly, before any crazy newbies can join back again under a new username, remove any existing registration link so that no new member can join.
Step 3: Make the Registration page into a second secret page.
Step 4: At the "Enter Fungi Fourms" page which lists the rules, add a joining request link, where members email the admins and mods to scedule an interview to see whether they will be a good member or not.
Step 5: If an applicant is accepted, allow them acess to the secret registration page, at which point it will be immediately moved so that the new member cannot release the location of it.
Results: Only good members are left in the fourms, newbies are all pre-approved as good members. If banned, people will be unable to rejoin because the registration fourm is hidden.
Let me away from this boulder!