Thread:RRabbit42/@comment-5369949-20120824225320/@comment-961279-20120825141803

I don't understand it, either. It's almost as if they thought to themselves, "I'm going to go someplace and be a jerk".

Rather than dwell on why it happens, it's more effective to just fix it and don't make a fuss. (Just notify an admin, like you did.) Read the Dealing with vandalism and spam help page for some advice about this.