Ah, conflict with the view i have on discussing bans, in the matter that they usually and easily become terrible flame wars where nobody wins, you point it out perfectly, my mistake mr deadperson, hat off to you.
I'll have to be blunt then, the admin doesn't like the banned person, the person has brought strife and drama to the server in multiple times, maybe the admin has also some part to blame, as you need two to tango, but it boils down to someone having power and someone who doesn't.
Admin gets tired of person, bans him out of his server, he reserves the right to deny anyone of a service in his server, and he has enforced this right. I am sorry you've lost someone you've hold in esteem (whoever this applies to), but this is how it is, and I am going to side with the supreme general emperor qazwsx on this.