I like to think we're pretty lenient about allowing folks to "defend" themselves. There are multiple moderators you can go to (and when I correspond with someone regarding a moderation, I usually try to copy one or more of them so if I'm out of line, they can say something). There's also the feedback forum.
However, there comes a point where there is no explanation. If someone posted several replies all over talkback with photos of naked people, then no, that person doesn't get to defend themself when the ban hammer comes down.
Likewise, if someone is publicly reprimanded for something, they do it again, and have to specifically be told *not* to do it a third time - that person doesn't really help their case.
I think all moderators have their PMs turned on, so if someone really wants to take issue with the moderation, they should PM the moderator (or post in a less aggressive manner on Feedback) what the issue is.
Although, in TJ's defense, I'd be interested in reading the original article posted by the individual in question. I'm curious if his summation of the situation is in anyway founded in reality or if it's 100% fantasy.