Charlie,
This is a private forum that was first set up by the MtGox people (I think, someone correct me if I'm wrong), and it's managed by the admin they appointed.
You've already been corrected, but if you had read my post properly you would have known that this forum predates Mt. Gox by several years. No offense, but you make yourself look pretty dense by weighing in with ignorant assertions, especially when the truth of the matter is right here in this thread. I humbly suggest that you should ensure that you know what you are talking about before you try to correct me on a matter I am clearly far better aquatinted with than you.
No one is expecting you to know everything, but when you assume you know more than someone else and you are wrong, well....
...you know what they say about what happens when you assume. You make yourself look like a bit of a cunt.

It is Theymos' right and obligation to remove those who are harming the quality of these forums.
I agree.
The ban was not a result of bias
How on earth would you know? I suspect you are making assumptions again. Haven't you learned your lesson about that yet?
there were plenty of neutral reasons to ban Goat: he was trolling and belligerent.
That is true. So why was he only banned when he criticized Theymos, and not before? I admit that he became more vexing recently, but it's a rather rum coincidence that his behavior was suddenly deemed to be intolerable as soon as he began to take issue with the personal dealings of Theymos, isn't it? Especially as this has happened a few times recently.
Just because Theymos has a personal disagreement with someone does not give them ban-immunity or a free pass to troll.
I never suggested that it should. However, as I have said many times now, if Theymos suddenly decides to ban someone right after they have a personal disagreement, and the official reason is behavior that was previously tolerated over a long period, then it is a cause for concern.
He did the right thing.
Yeah, maybe. But did he do it for the right reasons? That's up to everyone to decide. You certainly seem to have made your mind up. Personally I am not so sure.