I'm not familiar with the individual in question, so I couldn't have piled on, even if I wanted to. I don't think there's anything wrong with discussing what is publicly known and has been posted on an open forum, or the overall moderation of said forum. I think we should leave diagnosis to real life mental health professionals, and not attempt that remotely, through the text on a message board.
Not specific to MR, or any site in general, I think there is a mental health component to almost all trolling behavior. Online communication is, relatively speaking, a new phenomena. Many younger people have grown up with it, so that may seem like a bizarre statement, but global communication is only something we've really seen in the last century. Evolutionarily, our minds and bodies haven't adjusted to 24/7 communications. It's difficult enough to understand intent when speaking to someone in person, online is far more challenging, and simple miscommunication regularly occurs.
I'm going to use one example that has been publicly documented, featured in outlets such as Linus Tech Tips and OSNews, over the years. That is the story of Terry Davis who wrote
TempleOS. It's an entire operating system written by one man, in glorious CGA graphics, with a custom file system called "RedSea". He designed his OS to very specific specifications because god told him to. According to the author, TempleOS was to be the prophesied
Third Temple in Jerusalem, and this was its manifestation.
Terry Davis was a brilliant man, who clearly accomplished much, until he was diagnosed with schizophrenia. Other than "building" TempleOS, he said a number of extremely racist things both online and while recording himself in-person, believed that he was in a relationship with a science girl on Youtube even though they had never met, posted unfortunate videos of himself on his website which I shall not get into, was involved in a physical altercation with his father, and ultimately met an untimely end. Down the Rabbit Hole did an entire
documentary on TempleOS and its author. The presentation is respectful, and attempted to tell Terry's story without being exploitive.
Obviously, this is an extreme example of a mental health disease manifested on the internet. As Terry lost touch with reality, he sought out human connections online. It's a woeful story, and an example of a brilliant mind who had a tragic end. Some of the people he contacted online tried to help him, others made it worse, but it's likely that very little could have been done for him, since he was in his own world.
My point is that we never really know what a person is going through when we interact with them on a forum. Everyone has demons, they just manifest in different ways. The best solution is to ignore someone when we become irritated. That's why I have never gotten a warning or suspension at MR, not because I'm some angel, but because the rough and tumble just isn't worth it. Trollish behavior is mainly attention seeking, and that happens because of deficiencies in one's personal life, which is something best left to mental health professionals. If you find yourself getting upset by someone online, it's best to just close the browser and move on to something more fruitful.