And stating your opinion by using that attitude wont get you anywhere. Ban reasons are private, just as the staff board, reported posts and the infractions. Maybe the banned person is ashamed for the ban or so on.
Unfortunately this is not your community, you are not the one who decide how it works. If you are so obessed by knowing why someone got banned - which is something personal and not something the community has to know about, then you will have to ask the banned person yourself because if we wanted to make the reason public it would have been posted in the complaint thread already.