With the exception of spammers, we do not ban members unless there is a long history of rude posts, complaints from members, warnings, and usually temporary bans.
I have tried to find any reason for the ban Crasher8 refers to, and could only surmise that it was done in error at a time when there were a ton of spammers and I or someone else did it by accident. I tried to get old posts back, but couldn't.
The admins are pretty forgiving, if a banned member were to contact the Admins and discuss the issues and make a commitment to follow the rules, we would likely give yet another chance. That has happened. Some chose to burn their bridges by sending a bunch of name calling e-mails, which only serves to assure us that we made a correct decision.
It does not help his cause to have someone posting a one sided view on his behalf, it does not tell the whole story, and its not the place to discuss specifics about a member in any event.
A very good way to get a quick warning or a ban is by insulting members or CR administrators in a public post. I try to remove insulting posts that directly call someone a name, but obviously we do not read every post and rely on members to report serious issues.
There are a lot of borderline cases, and its very disappointing to see a long time member making subtle comments that goad another member into posting something offensive.
The thing to do is to flag the comment as offensive, and let the moderators decide if it should be removed, and possibly a warning issues. Firing back with a even more inappropriate comment does not work.