Brony,
Yes, he was/is literally obsessed by that thread he started and the arguments that arose from it. He asked to be banned for six months. I was reluctant at first, but then did agreed. Then he came back still raging when the ban ran out. Stalking might be excessive, but he certainly tried to continue that argument by whatever means he could - PM, emails (he was able to use the email list on the reading group we set up to get hold of certain members' email addresses) and Feser's - right down to the rather silly insults he uses. He did get my email and PM'd me, but I just blocked him, so he was stuck using Feser's blog, though Feser seems to have got sick of such silliness and deleted his ravings the last time he popped up (which was only a month or two ago, a year after the original thread that sparked it all off). I don't much like banning and other sanctions. I've preferred just to lock threads and delete posts and hope that sufficed. But I thought AKG did cross a line. Plus, given that he has shown clear issues, by raging about arguments in one thread for months, across the internet, it is probably better for him he was rebanned.
On Clinias,
I don't think he was banned. He just went off in a huff after he had his pro-slavery thread locked and was told to not keep posting to threads where he was the only active participant. It's one thing to post a couple of times without anyone else responding, but posting half a dozen times or more over an extended period, when no one else is contributing, is a bit silly, especially if much of what you post is conspiracy laden, anti-Semitic rants.