[Marc P.]

It's been said many times before in this thread, but vandals like this thrive on attention. It's the only reason they do this sort of thing. By posting all this, their information, all the posts, etc, you're doing exactly what they want you to do. The more attention brought to them, the brighter the spotlight on them, the more they will vandalize- because they know people are watching. Really, the best thing you can do about this sort of thing is very quietly and subtley undo whatever damage they do. When they see their efforts yield no results, they will stop.

I've dealt with my share of trolls and vandals on my own forum, and by arguing and making a large public scene, you are only feeding their original purpose in destroying such things- attention. I know it's difficult to ignore, and very difficult not to act, but for these sorts of things, it's best to act quietly and quickly, and hope no one notices. The more people know about it, the more it will happen. The more you post and complain about it, the more it will happen.