Archive the history? What do you mean? Make everything that happened with members public?
Anyway, I understand where Malte is coming from. Personally, I don't see a reason against saying who was banned, the ones that will never come back, but I don't understand why you must know who was almost banned.
Let me ask you this. Let's say, theoretically, on another board, you did something to embarrass yourself and nearly get yourself banned, such as starting a huge fight with someone or telling off an admin more than once. Now, would you want the admins to make this embarrassing info public so that future members can see and read it? Chances are, I'd think you wouldn't want that to happen to you.
This is pretty much what you are attempting to do here; you are attempting to get such information released public on the forum about members here that nearly got banned, thus embarassing them as a direct result.
As Petrie had suggested, if you find it so important for you to know who was nearly banned, and who was banned, then you could send a message to some members via PM and get info that way. That way, the information is not made public.