IF you have a chance look back into all the players that have been banned and in fact, some don't even have reasons. I read a few that got banned even were proven to not be cheating or metagaming or anything and were banned entirely from Alfa WITHOUT ONE STRIKE and completely circumventing the processes in place. I suspect due to the span and size of Alfa NWN1 that these things happened more out of a misuse of power, but also the complete distance of a set rotating group of admin that simply did what they wanted because in most cases, no one knew what was going on in the background, and simply no one stood up when injustices occurred to challenge them or even investigate.
Who? I know Andrew was, and then there was that Kelgorn guy. Neither were real abuse of powers, and both were made with the fullest of information. I do think both were handled poorly and in the wrong way, but what you say above (if referring to these situations) is a load of mis-information.
As for this thread in general, I have two comments to make as a past PA. During my terms as Player Admin, I have perhaps banned three, maybe four people. I can say with absolute honesty that none of them was banned lightly, with each one weighing down upon me. I'm the type of person that takes everything to heart, and having to ban a player (especially the couple who I have got on well with) hurts. Just ask Curm how much I've had to spend talking to him in order to try and convince myself I've done the right thing. However, in the end of the day I don't think any of the bans I put in place were the wrong decisions or made with the wrong intentions or information.
Second, in saying that, there has been one time in the past, to my knowledge, that someone has been unbanned. He's still around today and contributing to the community more than most people. He approached the Admin a few years after getting banned and make a good case so was unbanned. I believe it is documented for the DMs and Admin to read, if they want precedence.