They don't need to answer on the complaints that have nothing to do with them.
In my opinion, it should be between the staff/staff personnel and the users involved only.
Although sometimes other users who are not related to the case give a good answer, it usually ends up with the staff's friends defending them.
I have nothing against it, but I think it should be between the users involved and the staff only.
Keeps things tidy, too.
When exactly does this happen, and if it did ever happen I doubt it would stay that way without said person being told that if they don't have any actual information then they need to leave or they will be reported.