Because public discussions about the actions of staff members are forbidden. All this years when a player wanted to report a staff member he would simply P.M. the community manager and he/she would interview the staff member, in private.
Why? Because usually the proofs of the ban contain private informations e.g. IPs, usernames, payment or bank details etc (depending on the case). So as you understand there is no need the whole community to see all this things and keep in mind that not all staff members have access to every aspect of the server so each case is confidencial and it is handled by the staff member who issued the punishment. Of course higher ranked staff members, like administrators can interfere anytime they wish.